LOS ANGELES  – It could take up to eight weeks to find out what killed a missing Vancouver woman found in a LA hotel water tank.

Initial autopsy results have come back inconclusive and the coroner must now wait for the results of toxicology tests.

Meantime, tests of the water tank where the 21-year-old was found have come back showing no signs of a live bacteria that could have caused illness.

Lam was found in one of four water tanks on the roof of the Cecil Hotel.

The county Department of Public Health has, however, issued a do-not-drink order, and only water for toilets is flowing for hotel guests.

County health official Angelo Bellomo says chlorine in the water likely killed any bacteria in the tank where Lam’s body was found.

Guest complaints about low water pressure prompted a maintenance worker to make the gruesome discovery.

She went missing at the end of January.