First victim: Sarah DeLeon was murdered two days after a picture taken with her boyfriend Matt Utland - Carolyn Heckert's former lover - on 27 December 1989.
Carolyn Heckert, 48, was suburban mom of two and realtor until US Marshals arrested her last week at home in Smithville, Missouri
Now she is charged with 1989 cold case killing of Sarah DeLeon, 18, whose mother says was found stabbed multiple times in 'crime of passion'
Alleged murderer: Carolyn Heckert is behind bars now and facing life in prison (left) but in 1989 was a young US Postal Service worker (right). It was then she allegedly murdered her ex-boyfriend's new love, Sarah DeLeon, 18