A 15-year-old Oregon girl, her 19-year-old boyfriend and another man have been indicted for allegedly bludgeoning her father to death in his sleep and planning to kill another man.

Ellen Friar, her lover Gavin MacFarlane and 22-year-old Russell Jones II were arrested on Monday after the girl's father, 50-year-old Aaron Friar, was found dead east of Medford.

Local police say the victim was bludgeoned to death as he slept in his home in the 500 block of Benson Street in Medford.

An autopsy performed on the victim found the cause of death to be blunt force trauma to the head and the death was ruled a homicide.

According to investigators, Ellen Friar has been dating MacFarlane, but her father did not approve of their sexual relationship.

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Gavin MacFarlane (pictured left), 19, and Russell Jones, 22, (pictured right) were charged with murder after authorities say they helped kill MacFarlene's lover's father

Baby-faced murder suspect: Ellen Friar, 15, MacFarlane's girlfriend and the victim's daughter, will be tried as an adult

The body of 50-year-old Aaron Friar (center, pictured with friends) was found east of Medford, Oregon, on Monday

Medford police believe Friar was killed in his sleep at his Medford home on Benson Street over the weekend (Pictured: Benson Street)

Detectives believe that after killing Friar, his daughter and the two young men stole his car and used it to transport his body to a dirt embankment in the 9100 block of East Antelope Road, on the Oregon-California border, where it was recovered Monday afternoon.

On Thursday, the Jackson County grand jury returned an indictment charging Friar, MacFarlane and Jones with felony murder; murder; two counts of criminal conspiracy to commit murder; robbery in the first degree and tampering with physical evidence.

The conspiracy charges stem from the trio's alleged plan to kill Russell's father, Russell Pierce Jones I.

The district's attorney office did not provide any additional information on the apparently failed or aborted plot on Mr Jones' life.

Star-crossed lovers: According to investigators, Ellen Friar (pictured left) has been dating MacFarlane, but her father did not approve of her sexual relationship with the older man

The 19-year-old has been charged with third-degree rape stemming from his affair with the 15-year-old suspect

The trio of suspects are suspected of conspiring to kill the father of Russell Jones (pictured above)

MacFarlane was also charged with third-degree rape for having sex with Ellen Friar, who is a minor.

Speaking to the station KTVL, Utahna Stamper, a friend of Aaron Friar, described him as a generous man who was always willing to lend a helping hand with home repairs.

The grand jury heard an hour of testimony from six witnesses on Thursday and deliberated for just seven minutes before indicting the three suspects.

MacFarlane and Jones are being held in Jackson County Jail without bond. Ellen Friar was ordered held at the Jackson County Juvenile Detention Facility, but she will be tried as an adult.

Court records obtained by Mail Tribune show that in 2015, Jones pleaded guilty to third-degree sexual abuse involving a child under age 16 and was sentenced to probation and community service.