The 51-year-old’s death brought the number of people killed on Northern Ireland’s roads this year to 30.
The crash happened on the Manoo Road in Kesh, Co Fermanagh, at about 6 pm, Wednesday, June 10.
Police say a woman also injured in the accident in the single vehicle crash.
She is described as being in a stable condition in the hospital.
Mr Forsythe is from the village of Kesh.
The PSNI in Enniskillen want anyone who witnessed the crash to contact them on the 101 non-emergency number.