Dr Stephen Asiimwe, a respected Ugandan physician, epidemiologist and public health researcher, has died following a road crash in Tanzania, leaving members of the biking group he was travelling with struggling to continue their journey home.
The crash happened in Tanzania’s Tanga Region on Monday, September 21, 2026, while Asiimwe was travelling with members of the Free Bikers and Ride Safe group.
He had left Uganda with the group on September 16 for a motorcycle trip that took them through Nairobi, Kenya, before continuing to Tanzania. Asiimwe was serving as the team leader during the journey.
His death has sent shockwaves through two communities that knew him particularly well: Uganda’s medical and research community and the country’s growing fraternity of recreational motorcyclists.
Dr Stephen Asiimwe’s Death Leaves Fellow Bikers Shaken
The return journey that should have marked the end of another regional motorcycle adventure has instead become a difficult trip home.
By Tuesday, September 22, some members of the group had decided they could not continue riding their motorcycles following the loss of their colleague.
Several reportedly opted to travel back using public transport through Nairobi because they were too shaken to continue riding. Other members of the group chose to remain on their motorcycles, while some travelled alongside Asiimwe’s body as it was transported back to Uganda.
It is a reaction that reflects how deeply the incident affected those who were travelling with him.
For long-distance riding groups, trips of this nature often involve days of travelling together, planning routes, stopping together and relying on one another throughout the journey. Asiimwe was not simply another rider on the tour; he was leading the group.
What Happened to Dr Stephen Asiimwe in Tanzania?
Dr Stephen Asiimwe died following a collision involving a truck while riding in Tanga Region.
New Vision reported that the Ugandan physician was struck by a truck while riding his motorcycle on September 21. Fellow riders subsequently confirmed his death.
Other reports citing members of the riding group said the incident occurred while the motorcyclists were travelling together.
The circumstances surrounding the crash are expected to remain a matter for Tanzanian authorities to investigate.
What is clear is that the journey, which began as an adventure between friends and fellow riders, ended with the group mourning the loss of its leader.
Dr Stephen Asiimwe Was a Physician and Public Health Researcher
Away from motorcycling, Dr Stephen Asiimwe had spent much of his professional life working in medicine, epidemiology and public health research.
At the time of his death, he was an honorary senior lecturer at Mbarara University of Science and Technology, commonly known as MUST.
He also served as programme director of the MUST-Massachusetts General Hospital Global Health Collaborative, a partnership involving Mbarara University of Science and Technology, Mbarara Regional Referral Hospital and international health and academic partners.
His work extended across several major areas of public health.
These included HIV prevention, lung health, air pollution, ageing, cognitive impairment, chronic obstructive pulmonary disease and broader population-health research.
Uganda’s national research records also list Asiimwe as having participated in studies examining issues including COVID-19 vaccination, lung health and cognitive impairment among people living with HIV.
His career combined clinical knowledge with research focused on health problems affecting communities in Uganda.
A Strong Connection to Mbarara and Western Uganda
Dr Stephen Asiimwe had a particularly strong professional connection with Mbarara and western Uganda.
His work placed him at the centre of collaborations involving universities, hospitals, researchers and communities trying to improve healthcare and medical research in the region.
The Global Health Collaborative has worked to strengthen medical education, clinical care, research and health systems through cooperation between Ugandan and international institutions.
Asiimwe served as programme director of the Collaborative and was involved in research and capacity-building projects linked to MUST.
He was also associated with the Kabwohe Clinical Research Centre in Sheema District, where research has included work on HIV prevention and other community health challenges.
His contribution was not limited to producing research.
Colleagues also knew him as a mentor who worked with younger researchers and health professionals.
MUST Community Mourns Dr Stephen Asiimwe
Mbarara University of Science and Technology and its global health partners have joined family, friends and fellow riders in mourning Asiimwe.
The university remembered him for his contribution to research, innovation and mentorship.
His work had placed him within a network of Ugandan and international researchers examining some of the country’s most important public-health challenges.
One colleague recalled having discussed plans with Asiimwe only days before his death about possible collaboration on research into non-communicable diseases in western Uganda.
Those tributes paint a picture of someone whose work remained active right up to his final days.
Dr Stephen Asiimwe Was Also a Passionate Motorcyclist
Medicine and research were only part of Asiimwe’s life.
He was also known among friends as an enthusiastic motorcyclist who enjoyed long-distance journeys and exploring different parts of East Africa.
His interest in riding was not occasional.
Previous records from Mbarara University describe him as having served as president of a bikers’ club in Mbarara, showing that motorcycles had long been part of his life outside his professional work.
He also combined his interest in outdoor activities with running and travel.
Earlier in 2026, Asiimwe participated in a long-distance motorcycle journey to Fort Portal and took part in the Fort Portal City Marathon before continuing his riding adventure through western Uganda.
The Tanzania journey therefore followed a pattern familiar to those who knew him: combining travel, physical activity and the company of fellow riders.
His Death Renews Attention on Road Safety
The circumstances surrounding Dr Stephen Asiimwe’s death have also renewed attention on road safety across East Africa.
Motorcyclists are particularly exposed when sharing highways with buses, trucks and other large vehicles, making responsible road use important for everyone travelling on busy regional routes.
For Asiimwe, road safety was already a subject with personal and professional meaning.
As a public health specialist, he had previously spoken publicly about the human cost of preventable road deaths after losing a relative in a road crash earlier in 2026.
His own death on the road just months later has made those earlier concerns especially poignant for friends and colleagues.
But beyond the circumstances of the crash, those mourning him have largely focused on the life and work he leaves behind.
A Difficult Journey Home for Uganda’s Biking Community
For the Free Bikers and Ride Safe group, the trip back to Uganda is now very different from the one they had expected.
Some riders are continuing home on their motorcycles. Others have decided that, emotionally, they cannot complete the journey on two wheels and are returning through Kenya using public transport.
Asiimwe’s body was also being transported by road back to Uganda on Tuesday.
It is an unusually sombre end to a journey led by a man who appears to have embraced both his demanding professional career and an active life outside medicine.
Dr Stephen Asiimwe leaves behind a record of work in public health, medical research, education and mentorship, particularly in western Uganda.
Among fellow bikers, however, he will also be remembered more simply as one of their own — a rider, travelling companion and team leader whose final journey has left friends facing a difficult ride home without him.
