TROY — The mother of a 6-year-old boy who died two days after he was found in a bathtub made a Valentine's Day suicide pact with her boyfriend but backed out before she could be injected with a lethal dose of heroin, city police said.

While Nicole Bauer did not follow through, her boyfriend Kevin Cox overdosed and was hospitalized in Pittsfield, Mass. He's listed in grave condition, police said.

Police on Tuesday revealed more details on the status of their investigation into the Feb. 11 death of Davonte Paul. The Times Union reported Monday on Cox's suicide attempt.

So far, no one has been charged in connection with the boy's death, which is being investigated as a possible homicide.

As the Times Union reported last week, Davonte was found unresponsive in a bathtub in the couple's Troy home on Feb. 9. He was taken to Samaritan Hospital in Troy and then to Albany Medical Center, where he was placed on life support. He died two days later.

Troy police said last week that while Davonte was initially “reported to have drowned in a bathtub,” their investigation revealed that "drowning is not believed to be the cause of his death.” They declined to provide further information.

The boy's father, Freeston Paul of Ulster County, said he was told by doctors at Albany Medical Center as well as a Troy detective that Davonte died from the effects of hypothermia; he did not have fluid in his lungs, which would be indicative of a drowning.

Police on Tuesday confirmed that Davonte died from hypothermic shock, which can occur when body temperature drops to 86 degrees.

Those findings cast doubt on Bauer's claim the boy drowned in the bathtub. Police have not disclosed her current location.

While Davonte was on life support, an official from Child Protective Services also came to the hospital and took photos of bruises on his arms and feet, Paul said. Paul then received notices — dated Feb. 11 — from Rensselaer County Family Court that concluded neglect had occurred.

The letters, obtained by the Times Union, state that a Child Protective Services agency had “substantiated” that Bauer and Cox, her boyfriend, had allegedly “neglected your child."

But the boy's father said the acknowledgment came after officials in Ulster County ignored his repeated warnings that his child was imperiled living with his mother and her boyfriend, an ex-convict who had served prison time in a domestic violence case.

Paul said Bauer showed him bruises on her body that she claimed were inflicted by Cox not long after she began her relationship with him three years ago.

Paul filed a report with Ulster County Child Protective Services detailing the alleged abuse. CPS did not substantiate the allegation, however, and the family court judge presiding over the couple's disputes took no action, Paul said — a pattern that would repeat itself.

Paul said that when Davonte was 4, the boy told​ him that Cox was pouring water on him as a means of waking him up. Paul not only reported the alleged abuse to Child Protective Services, but his son confirmed the incidents to a CPS official as well, Paul said.

Again, nothing came of the allegation.

Another time, Davonte allegedly told his father that Cox was being excessively rough with him when playing, including restraining him to the point that Davonte would cry. Paul reported the incident to CPS again, but nothing resulted from the complaint.