Abiriga was killed together with his body guard by two men on a motorcycle.
Abiriga was into his first term as a Member of Parliament having been elected in the 2016 general elections.
In the House, he was one of the staunchest proponents of the of the move to amend the Constitution so as to have the 75-year upper age limit for the president removed.
Before that, Abiriga served in the army of then-Ugandan President Idi Amin Dada before a stint in the National Resistance Army and finally in the UPDF where he held the rank of Colonel.
Before joining elective politics, Abiriga served as RDC for Arua for 12 years following his appointment by President Yoweri Museveni in 2001.
He was then moved to Yumbe in a similar role before he resigned to run for the Arua Municipality seat.
At the scene of crime. Residents gather around Abiriga's car after the shooting. (Courtesy photo)
President Museveni's reaction to Abiriga's death.
I have received news about the senseless killing of Arua Municipality MP, Hon Ibrahim Abiriga, and his bodyguard on the city's outskirts. I have tasked security agencies to expeditiously find these killers and the nation will be updated soon. May Hon Abiriga's soul rest in peace.— Yoweri K Museveni (@KagutaMuseveni) June 8, 2018