A Pennsylvania woman was arrested for allegedly setting her boyfriend on fire this weekend - but her partner of 10 years says it was actually his fault.

Police say 38-year-old Leigh Ann Sepelyak and her boyfriend, identified as Grady Spencer III by the Pittsburgh Tribune-Review, got into a fight Saturday night or early Sunday morning at their apartment in Penn Hills, Pennsylvania.

After Spencer went to sleep, they say Sepelyak doused him in gasoline and then set him on fire with a kitchen match. The mattress caught fire, and so did the lower part of Spencer's body.

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Leigh Ann Sepelyak, 38 (left), was arrested on Sunday for allegedly setting her boyfriend, Grady Spencer III, on fire after the two got into a fight

When Spencer jumped out of the bed screaming in pain, police say Sepelyak regretted her decision and used buckets of urine to put out the flames.

The couple live in the basement apartment of Sepelyak's parents' home, which doesn't have a bathroom. They have kept the buckets in the basement so they don't have to disturb her parents every time they want to use the restroom.

'I think they had enough urine there to put him out,' Penn Hills police Chief Howard Burton said.

The commotion woke Sepelyak's parents, who helped get Spencer to UPMC Mercy hospital.

Police say Sepelyak regretted her decision and used buckets of urine to put out the flames

After the incident, a gas can and a mattress were seen on the curb outside the home, waiting to be taken by the trash collectors

The couple live in the basement of Sepelyak's parents' home. They keep the buckets so they don't have to disturb her parents every time they use the restroom

It was there that hospital workers first called to inform police of the incident.

Sepelyak was arrested on Sunday on charges of attempted homicide, arson, recklessly endangering another person and other offenses. She was released after posting $100 bail on Monday.

Spencer was in critical condition when he first reported to the hospital, with burns to 25-30 per cent of his body. But police say his injuries do not appear life threatening.

In fact, Spencer was strong enough to speak to reporters from the Pittsburgh Tribune-Review on Tuesday from his hospital bed.

In an interview on Tuesday, Spencer (right), said the incident was actually his fault

In that interview, Spencer countered what police said about the incident - saying it was actually his fault.

Spencer told the Tribune-Review that he was 'completely drunk' when he tried to fix a weed whacker Saturday night, spilling gasoline on his lower body. He says he caught fire when he lit a match for a cigarette.

If it hadn't been for his girlfriend, Spencer says things 'would have been a lot worse'.

My crotch would have melted if she didn't [douse me with urine]. I can only thank her for that. Grady Spencer III

'My crotch would have been melted if she didn't [douse me with urine],' said Spencer. 'I can only thank her for that.'

He went on to speak highly of his girlfriend, who he has been with for the past decade.

'Leigh Ann has never been in trouble in her life. She is in no way, shape or form a criminal...She's not violent and would never hurt anybody. She didn't do anything to me,' he said.

When asked about Spencer's version of events, Police Chief Burton said that the charges were filed based on the information they received at the time. He said the case will go forward, and Spencer will have to testify his version of events in court.

'If (Spencer) wants to tell his side of the story, he'll have to testify in front of (Penn Hills District Judge Anthony DeLuca) and ultimately (DeLuca) will have to decide,' Burton said.

Sepelyak's first hearing is scheduled for July 17.

Spencer said he spilled gasoline on himself when he was fixing a weed whacker, an then lit himself on fire when he lit a match for a cigarette