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Elisa Lam Update: Woman found in L.A. hotel's water tank accidentally drowned, authorities say

FILE - This file photo released by the Los Angeles Police Department shows Elisa Lam of Vancouver, B.C. Los Angeles police say a body has been found on the roof of the Cecil Hotel where Lam, a Canadian tourist, was last seen last month. (AP Photo/Los Angeles Police Department, File)
Uncredited
Elisa Lam
AP Photo/Los Angeles Police Department, File

(CBS/AP) LOS ANGELES - Authorities say Elisa Lam, a Canadian woman whose body was discovered in a downtown Los Angeles hotel's rooftop water tank, accidentally drowned.

PICTURES: Official: Woman accidentally drowned in LA hotel water tank

Coroner's Lt. Fred Corral says the 21-year-old Lam's cause of death was ruled an accident on Thursday. Corral says the body had no sign of trauma indicating foul play. Lam also had bipolar disorder.

Lam traveled alone to Los Angeles from Vancouver, British Columbia, on Jan. 26 and was last seen five days later by workers at the historic Cecil Hotel near Skid Row.

Before she died, hotel surveillance footage showed Lam inside an elevator pushing buttons and sticking her head out the doors, looking in both directions.

Lam's body was found on Feb. 19 in the water tank after hotel guests complained of low water pressure. According to CBS Los Angeles, public health officials assured hotel guests that the water in the building was not tainted because of Lam.

The station reports hotel employees said doors providing access to the roof were locked and had alarms, but the four water tanks were not locked. It is unclear how Lam gained access to the roof.

Complete coverage Elisa Lam on Crimesider