Man, 48, pleads guilty to murder 32 years after Arkansas woman found dead

A 48-year-old man already serving a life sentence for capital murder pleaded guilty to the 1991 murder of another woman, the Arkansas State Police announced Tuesday. 

Sabrina Underwood, 19, disappeared after being dropped off in Boone County, Arkansas by her mother. Underwood planned to hitchhike to visit her boyfriend, a prison inmate, but when her boyfriend called to ask why she did not make her scheduled visit, a missing person's report was filed. Three months later, hunters found a bundle of clothes and human remains, which were later determined to be Underwood's. 

Underwood's murder remained unsolved until an inmate told Arkansas State Police investigators that Rick Allen Headley confessed to the killing in a letter written while serving a life sentence. Headley had pleaded guilty to capital murder after stabbing his estranged wife to death. He was serving his sentence in a maximum-security unit, according to police.