Police say Justin Levasseur remains in custody.
The Integrated Homicide Investigation Team is looking into the random attack on 79-year-old Charan Dhandwar at about 7 p.m. on Wednesday.
Residents immediately called police but Dhandwar died at the scene.
Police say they are looking for the male driver of an SUV or van that struck Levasseur as he was attempting to flee the area.
Sgt. Stephanie Ashton says Dhandwar's family is grateful for the support they've received but they are now asking to be left to grieve in peace.