Close friends of David Koenig and Ellen O'Meara carried out a deadly suicide pact.
The pair took their lives at a Manhattan Hotel after knowing one another for only one year.
The couple was found dead on Thursday night by a cleaning woman at the Yotel Hotel in NYC.
Koenig, 33, and O'Meara, 30, left a 'thank you note' to the cleaner along with a cash gratuity taped to a plastic sheet obstructing the interior of the room in the shocking incident.
The tragic couple also left behind the book 'Suicide and Attempted Suicide: Methods and Consequences' by Geo Stone.
"Their friends were very upset, but not surprised," a police officer revealed.
"It's almost as if from the first day these two people met, they knew they were going to die together."
It is understood that the couple only met a year ago before entering into the deadly pact.
One of the last text messages that Koenig sent to the percussionist of their band 'Cesspool' said that he wouldn't be at practice, a source said.
And someone claiming to be a friend of O'Meara's knocked on her neighbor's door and said: "My friend, I'm worried about her."
"She was very private - she never had any friends over. Never saw any men at all," said neighbor Katherine Zeppelin, 54.
The two were staying in a room on the 18th floor of the Yotel Hotel on 10th Avenue in the Hell's Kitchen neighborhood of Manhattan just before they died.
They left behind a note saying: "Don't look behind the curtain. We're dead. This is for you."
Despite this instruction the hotel cleaner found them both dead, lying in bed with a plastic bag over both of their heads.
The bag had plastic tubes leading to two nitrous oxide canisters, according to the report.
Also found in the room was a signed suicide note explaining the pair's intent to kill themselves and with the last will and testament of them both.
For confidential help, call the National Suicide Prevention Lifeline at 1-800-273-8255.
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