Turner was charged with murdering Ms Washington's six-and-a-half month old foetus in 1989, but was not charged with killing Ms Tripplett's unborn child.
Turner becomes one of Los Angeles' most notorious killers, joining the so-called "Freeway Killer" William Bonin, who was convicted of 14 murders and "Night Stalker" Richard Ramirez who was found guilty of 13 slayings.
In 1980, he was apprehended in Ambato and ultimately charged with 110 murders, for which he plead guilty.
At a hearing in Los Angeles, Turner was handed the death sentence for the 10 murders and handed a 15-years-to-life sentence for murder charges relating to the unborn baby.
Born on October 8, 1948 in Santa Isabel, Colombia, Pedro Alonzo Lopez endured an early life of homelessness, violence and sexual abuse, becoming incarcerated during early adulthood.
Upon his release he eventually embarked on a killing spree where he targeted young girls from his home country, Peru and Ecuador.
His father, Medardo Reyes, was a member of the country’s right wing party who was killed in La Violencia, the armed conflict of the era that would have repercussions for years to come.
Lopez’s mother Benilda was three months pregnant with her son at the time of his father’s death.