WELLINGTON, Fla. – A man accused of masturbating while looking through a girl's bedroom window in Wellington was beaten up by the girl's father and arrested, deputies said.

Geoffrey Cassidy, 48, was arrested Monday on a charge of lewd and lascivious exhibition. Cassidy's arrest photo shows him with a black eye and a cut on his lip.

According to a Palm Beach County Sheriff's Office probable cause affidavit, the girl's father caught Cassidy crouched in some bushes by the window with his hands in his pants.

The father yelled at Cassidy, who ran away. But the father, identified by WPBF as former NFL defensive back Tony Beckham, chased after Cassidy and tackled him to the ground.

"I couldn’t believe it. I was like, 'Is this for real?’ I thought I was getting 'Punk'd,'" Beckham told WPBF.

Beckham's wife came outside, saw her husband holding down Cassidy and called 911.

"I caught him at the apartment over there and we just had a good conversation," Beckham said.

When a deputy arrived, Cassidy and Beckham were fighting. According to the affidavit, Cassidy tried to run away, but he stumbled and fell down. The deputy then placed him in handcuffs.

The girl told the deputy she had just gotten out of the shower and was getting dressed when Cassidy was looking through the window.

Cassidy was taken to Wellington Regional Medical Center to be treated for fractures to his face and eye. Cassidy denied looking in the window, claiming he was in the neighborhood because his car had broken down and he was waiting for it to cool down.

Beckham spent five seasons in the NFL as a cornerback for the Tennessee Titans and Detroit Lions.

Cassidy was being held at the West Detention Center on a $1,500 bond.