The Special Investigations Unit (SIU) says it responded to a 911 call just after midnight at the subway station in the east Toronto suburb of Scarborough.
CBC News overnight cameraman Tony Smyth reports the shooting happened at 682 Warden Ave., just south of the subway station, after a TTC fare collector was robbed at gunpoint.
Investigators say there was "an interaction" between police and a man near the station, and the man was fatally shot.
Eight investigators and three forensic investigators have been assigned to the case.
Warden station is closed Wednesday morning for the investigation. Shuttle buses are operating from Kennedy to Victoria Park stations, according to the TTC (see details below).
The SIU is an arm's-length agency that investigates reports involving police where there has been death, serious injury or allegations of sexual assault.
How the investigation is affecting TTC service
The police investigation at Warden station has led to the following route diversions on the TTC.- Trains on the Bloor-Danforth line (Line 2) are bypassing Warden station, which is closed. Shuttle buses are operating between Victoria Park and Kennedy Station.
- The 135 Gerrard bus is diverting both ways via Danforth Rd, Danforth Ave.
- The 7 Birchmount & 102 Markham bus are diverting both ways via St Clair, Pharmacy, Denton, Victoria Park .
- 70 O'Connor & 68 Warden buses diverting to Kennedy.
- 9 Bellamy & 16 Mc Cowan route diverting southbound via St Clair.
Also on HuffPost