A 19-year-old from Brampton was killed after an ATV crash in Amaranth last week, Dufferin OPP say.
Police said they attended a residence on Mono-Amaranth Townline last Monday afternoon after receiving reports of a collision.
Three riders were on the ATV at the time, one of which was air-lifted to a Toronto area trauma centre with life-threatening injuries and has since died, police said.
The other two occupants were treated with minor injuries and released from a local hospital, officers said.
The cause of the collision is still under investigation.