A 24-year-old man is dead, and his twin brother is in serious condition after an early morning crash in Bolton.

Police say the fatal collision happened just after 4:00 a.m. on Sunday at the intersection of Sant Farm Drive and Queensgate Boulevard.

Caledon OPP is investigating how the driver lost control of the vehicle, causing him to drive through the intersection and hit a tree on Landsbridge Street.

Police say the driver was killed in the collision and his passenger was taken to a Toronto-area hospital with critical injuries.

Investigators believe speed and not wearing a seatbelt were factors in the deadly crash.

Police have not been able to rule out whether alcohol or drugs were a factor, they are waiting on the toxicology results.

Anyone with information is asked to contact the Caledon OPP.