Former soldier Kyle Clifford has been found guilty of raping his ex-girlfriend Louise Hunt during a triple murder attack.
The 26-year-old had previously admitted to murdering Louise, 25, her mother Carol, 61, and sister Hannah, 28.
The jury at Cambridge Crown Court delivered their verdict after hearing evidence about the attack at the Hunt family home in Bushey, Hertfordshire.
The incident took place on July 9 last year, just 13 days after Louise had ended their relationship.
Clifford had already pleaded guilty to false imprisonment and possession of the weapons used in the killings.
Prosecutors revealed Clifford used a crossbow to kill Louise and her sister Hannah.
He also stabbed their mother Carol to death with a 10-inch butcher’s knife.
The victims were the wife and daughters of BBC racing commentator John Hunt.
During the attack, Louise was tied and gagged with duct tape.
The court heard Clifford committed the rape as an “act of spite” after Louise had broken up with him less than two weeks earlier.
Clifford had claimed the DNA evidence found on Louise’s body was from a consensual sexual encounter 16 days before the attack.
However, prosecutors argued this explanation was “completely untenable”.
The jury rejected Clifford’s defence after considering the evidence presented during the trial.
Clifford chose not to attend his trial at Cambridge Crown Court.
Lisa Kiff, a Senior Crown Prosecutor with the CPS, said: “Kyle Clifford is a murderer and a rapist who carried out a savage act of violence against three women.
“His crimes are among the very worst I have encountered in my career, and he now rightly faces a life sentence behind bars.
“On behalf of the Crown Prosecution Service, I want to express my heartfelt sympathies to the Hunt family. I have been personally touched by their strength, dignity and courage in the face of overwhelming trauma.
“We hope some solace can be found in today’s verdict and that they feel justice has been secured for Carol, Hannah, and Louise.”
The former soldier will now face sentencing for all offences including the murders, rape, false imprisonment and weapons charges.