A former Maxim and Playboy Italia model and her boyfriend murdered a 71-year-old California psychiatrist in Las Vegas, according to a former roommate whose cooperation with prosecutors could get her probation in the case.

Diana Nicole Pena pleaded guilty Tuesday to accessory to murder after the slaying, reduced from a murder charge.

She told a judge she knew at the time that her former housemates, Kelsey Turner and Jon Kennison, killed Dr. Thomas Burchard.

FILE - This undated Clark County Detention Center file booking photo shows Diana Nicole Pena. A lawyer says Kelsey Nichole Turner, a 26-year-old former magazine model, her boyfriend and their former roommate are headed toward trial in the killing of a California psychiatrist in Las Vegas. Attorney Brian Smith said Friday, May 31, 2019 that Turner, Jon Kennison and Pena are due before a judge on Monday, June 3, on murder and conspiracy charges in the slaying of 71-year-old Thomas Kirk Burchard. (Las Vegas Metropolitan Police Department via AP)
FILE – This undated Clark County Detention Center file booking photo shows Diana Nicole Pena. A lawyer says Kelsey Nichole Turner, a 26-year-old former magazine model, her boyfriend and their former roommate are headed toward trial in the killing of a California psychiatrist in Las Vegas. Attorney Brian Smith said Friday, May 31, 2019 that Turner, Jon Kennison and Pena are due before a judge on Monday, June 3, on murder and conspiracy charges in the slaying of 71-year-old Thomas Kirk Burchard. (Las Vegas Metropolitan Police Department via AP)

Details were submitted under seal, with Turner and Kennison due in court Thursday on murder and conspiracy charges. Their attorneys say they’ll plead not guilty.

Pena’s attorney, Jess Matsuda, says the 31-year-old Pena had nothing to do with Burchard’s death.

His body was found March 7 in the trunk of Turner’s car in the desert outside Las Vegas.

FILE - This undated file photo provided by the San Joaquin County Sheriff's Office shows Kelsey Nichole Turner. A lawyer says Turner, a 26-year-old former magazine model, her boyfriend and their former roommate are headed toward trial in the killing of a California psychiatrist in Las Vegas. Attorney Brian Smith said Friday, May 31, 2019 that Turner, Jon Kennison and Diana Pena are due before a judge on Monday, June 3, on murder and conspiracy charges in the slaying of 71-year-old Thomas Kirk Burchard. (San Joaquin County Sheriff's Office via AP, File)
FILE – This undated file photo provided by the San Joaquin County Sheriff’s Office shows Kelsey Nichole Turner. A lawyer says Turner, a 26-year-old former magazine model, her boyfriend and their former roommate are headed toward trial in the killing of a California psychiatrist in Las Vegas. Attorney Brian Smith said Friday, May 31, 2019 that Turner, Jon Kennison and Diana Pena are due before a judge on Monday, June 3, on murder and conspiracy charges in the slaying of 71-year-old Thomas Kirk Burchard. (San Joaquin County Sheriff’s Office via AP, File)
FILE - This undated photo released Thursday, April 18, 2019, by the Las Vegas Metropolitan Police Department shows Jon Logan Kennison. A lawyer says Kelsey Nichole Turner, a 26-year-old former magazine model, her boyfriend and their former roommate are headed toward trial in the killing of a California psychiatrist in Las Vegas. Attorney Brian Smith said Friday, May 31, 2019 that Turner, Kennison and Diana Pena are due before a judge on Monday, June 3, on murder and conspiracy charges in the slaying of 71-year-old Thomas Kirk Burchard. (Las Vegas Metropolitan Police Department via AP, File)
FILE – This undated photo released Thursday, April 18, 2019, by the Las Vegas Metropolitan Police Department shows Jon Logan Kennison. A lawyer says Kelsey Nichole Turner, a 26-year-old former magazine model, her boyfriend and their former roommate are headed toward trial in the killing of a California psychiatrist in Las Vegas. Attorney Brian Smith said Friday, May 31, 2019 that Turner, Kennison and Diana Pena are due before a judge on Monday, June 3, on murder and conspiracy charges in the slaying of 71-year-old Thomas Kirk Burchard. (Las Vegas Metropolitan Police Department via AP, File)

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