Ohio man accused of setting father's girlfriend on fire tells cops he 'doesn't know what happened'

An Ohio man accused of setting his 'step mom' on fire told police he 'doesn't know what happened' when officers discovered the woman badly burned with her 'teeth knocked out' in the backyard of their home.

Robbi Davon Robinson Jr. was arrested by Fairfield Township Police in connection with the horrific act of arson and released bodycam footage revealed the moments after the attack. 

Brenda Scott, who is dating Robinson Jr's father, can be heard gasping for air in the backyard as she told oncoming police that she couldn't breath and that her teeth were knocked out.

'I can't breathe! My inhaler's in the house... I can't breathe, he knocked my teeth out,' she can be heard explaining frantically in the redacted footage. 

Robbi Davon Robinson Jr. told police he 'doesn't know what happened' when officers discovered his 'stop mom' Brenda Scott badly burned with her 'teeth knocked out'

A short time later, Robinson Jr can be seen approaching police appearing shocked by the unfolding incident.

'I don't know what happened,' Robinson is heard saying in the video. 'It just went off.'

Robinson Jr., 23, has been arrested in connection with the horrific act of arson which occurred some time on Thursday morning

Scott reportedly jumped from the second floor of their home and was found 'severely burned' when emergency services arrived at the scene.

What led to Scott's dramatic escape remains unclear. Robinson Jr has been taken into custody and a judge set his bond at $200,000.

Robinson continued his disbelief when police explained what had happened to Scott.  

'Your stepmother jumped out the back,' an officer said in the footage.

'Oh, she did?' he can be heard replying.

Neighbor Dennis Williams told WKRC that his dogs alerted him to the commotion and he ran outside to find Scott distressed and covered in burns, before calling 911.

'Water with gasoline, he threw it on her,' Williams told dispatchers on the call, the outlet reported.

Officers were also seen trying to reassure Scott one officer turning to the distressed woman asking her to stay awake as ambulances made their way to the scene.

Robinson Jr. protested his innocence following the discovery of a woman he termed his 'stepmother' 

Scott was discovered by Dennis Williams, a next door neighbor who could see her home from his own property

The officer proceeds to handcuff Robinson saying: 'until I find out what's going on.'

Emergency services raced to the scene following reports of a woman having been set on fire in the backyard of the home at about 10.30 am on Thursday.

Scott was sprawled out on the grass and pleading for help.

'I said, ''What happened, what happened?''' Williams explained. 'And she said, ''He set me on fire''.'

'She had just terrible, terrible burns—I mean, I'm no expert, but at least half her body—I mean terrible burns. She wasn't still on fire at that point, but there was a little bit of flame next to her that was dying.

'It was pretty traumatizing to see and everything that happened, but again, I'm glad I was in a position to help.

Police vehicles are seen outside the home where the incident took place on Thursday morning

Scott was airlifted to UC Medical Center in critical condition and underwent surgery. 

Robinson, who referred to his father's girlfriend as his stepmother, has been detained at the Butler County Jail. 

He faces charges of first-degree aggravated arson and second-degree felonious assault and is due to appear in court May 17.

Fairfield Township Police Sgt. Brandon McCroskey said the entire case was chilling.

'It's one that makes your hair stand up on the back of your neck, I don't care how long you've been doing it.'