The deceased were 31 year old Gurinder Jeet Singh Lidder of Mono, 22 year old female Karanpreet Singh Gill of Barrie, and 24 yera old Sunny Khurana of Brantford.
The cause of the collision is still under investigation.
Officers were called to the scene on March 2nd at approximately 8:30 pm. Initial reports indicated a work van and a a semi-tractor trailer collided.
Two occupants were pronounced at the scene with two more rushed to local hospital. One of the transported patients succumed to their injuries in hospital.
The Wellington County OPP are asking anyone with information on the collision to call 1-888-310-1122.