Los Angeles County Sheriff's deputy Neil Kimball, 45, was arrested on Friday on suspicion of raping a 14-year-old girl whose case he was handling

A Los Angeles County Sheriff's deputy who investigates sex crimes has been arrested on suspicion of raping a 14-year-old girl whose case he was handling.

Neil Kimball, 45, was arrested on Friday following a lengthy investigation by the sheriff's criminal internal investigation bureau.

He is being held on $2 million bail after being booked for suspicion of rape by force and preventing or dissuading a victim from testifying.

Kimball, who has been with the department for 20 years, is accused of attacking the 14-year-old when he was investigating her case with the Special Victims Bureau.

The rape allegedly occurred in November last year in Ventura County.

It was uncovered after one of Kimball's colleagues was reviewing his cases when he took medical leave, Los Angeles County Sheriff Jim McDonnell told KABC.

Kimball, who has been with the department for 20 years, is accused of attacking the 14-year-old when he was investigating her case with the Special Victims Bureau

Kimball, who has been off-duty due to medical leave since August, has been relived with out pay pending the investigation.

The department is currently reviewing roughly 300 cases that Kimball has investigated for the Special Victims Bureau.

Kimball was investigated back in 2009 after a woman complained to the sheriff's office that he had allegedly forced her to touch his genitals.

He was called to investigate a case at a Travel Inn and was questioning a group of women at the time, according to documents.

Prosecutors declined to charge him in that case because there was insufficient evidence.

Kimball is expected to be arraigned next week.