A motorcyclist was killed Friday after slamming into the side of another vehicle.


Calgary police say the bike hit the vehicle's door just before 6 p.m. in near Memorial Drive and 59 Street.


"The driver's helmet was not securely attached and came off at the point of collision," a police release said.


The 22-year-old male driver of the motorcycle died at the hospital. A woman in the vehicle was treated for minor injuries.


Police believe excessive speed may have been a factor in the motorcycle crash.