UPDATE TUESDAY 5/20:
ATHENS, Ohio (WSAZ) --New details were released Tuesday in the deaths of two college students found dead in a bathtub.

Preliminary autopsy results show that Kelly Armbruster and Christopher Theil probably died from a drug overdose.

The report also ruled out drowning as the cause of death -- there was also no sign of significant trauma.

Theil’s mother found the pair dead in a bathtub at the River Park Tower Apartments in Athens last month.

Armbruster was a student at Ohio University; Theil attended Hocking College. Police say they were boyfriend and girlfriend.

In the 911 call made Saturday morning, Cynthia Welden said she pulled her son and his girlfriend out of the tub at an apartment in Athens.

A police report says Hocking College student Christopher Theil and Ohio University student Kelly Armbruster died sometime between 1 a.m. and 6:18 a.m., when authorities were called.

Athens Police Capt. Tom Pyle says there were no obvious signs of foul play. He says police are awaiting autopsy results to determine the cause of death and says the full findings could take up to eight weeks.

Here is an excerpt from the 911 call:

Dispatcher: "What's going on there?"
Caller: "I just pulled my son and his girlfriend out of the bathtub."
Dispatcher: "Pardon?"
Caller: "I just pulled my son and his girlfriend out of the bathtub."
Dispatcher: "Okay. Are they breathing?"
Caller: "No."
Dispatcher: "Okay... Are they... Do you know..."
Caller: "No, they are not."

Police say the bodies of Kelly Armbruster of Powell and Christopher Theil of Athens were found inside an off-campus apartment at Riverpark Towers on N. McKinley Avenue.

Both were 22 years old.

Armbruster was a student at Ohio University in Athens. Her Facebook profile indicates that she graduated from the school in 2005, was from Dublin, Ohio, and was in a relationship with Theil.

Theil was a student at Hocking College in nearby Nelsonville.

Athens Police say they were called to the complex at 6:18 a.m. Saturday. They are not releasing other details of their investigation.

The Montgomery County Medical Examiner's office is conducting autopsies.