A 73-year-old grandmother was found guilty  of first-degree murder on Wednesday after gunning down her third husband while he was sleeping. It took the El Dorado Superior Court jury in less than two hours to convict Colleen Harris of murdering Robert Edward 'Bob' Harris in their Placerville, California home in 2013. Decades before, in 1985, Colleen Harris, a Placerville Land surveyor, shot dead her second husband and the father of her three children, 46-year-old James Batten, after claiming he had been abusive towards her. Colleen Harris (right), 73, pictured with defense attorney David Weiner, was found guilty of first-degree murder on Wednesday after shooting her husband while he was sleeping in 2013 . Colleen Harris wept in court after the El Dorado Superior Court jury announced their decision. It took them less than two hours to convict her of murder . Colleen Harris will be sentenced for the killing of her third husband on June 5. She stands to receive 50 years to life for first-degree murder with a firearm . Both killings were carried out in the same home with the same type of gun, and in both cases, after pulling the trigger, she claimed she had temporary amnesia and could not remember doing it. Colleen Harris will be sentenced on June 5, standing to receive 50 years to life for first-degree murder with a firearm, according to the Sacramento Bee. She cried and put her hand over her face as she was found guilty. Her initial trial testimony was that Bob Harris may have committed suicide, and later Colleen Harris claimed that the shooting was an accident wherein the couple had wrestled over the gun on their bed. Bob Harris, a U.S. forest supervisor, baseball umpire and sheriff's volunteer, was having an extramarital affair with a 34-year-old doctoral student and teacher he met in Mongolia, the court heard. Colleen Harris (left) first testified that Bob Harris (right) may have committed suicide. But she later said that Bob Harris's death was an accident that happened when the couple were wrestling over a shotgun on their bed . Bob and Colleen were married in 1990. They had two sons and a daughter together before divorcing in 2004. They married again a year later . In 1990, Bob and Colleen Harris married and had two sons and a daughter. They divorced in 2004 but then married again a year later. Then in 2012, as Harris took a trip to Mongolia, where he taught environmental conservation to students, he met another woman and began a relationship with her, the Bee reported. When he returned to California, he and his wife separated and he moved out. But when Colleen Harris was house-bound following hip-replacement surgery, he returned to the Placerville home to help her. And on January 5, 2013, she overheard her husband making a call to his love interest overseas and later that night or the following morning, she shot him as he slept, prosecutors said. She then allegedly drove to San Francisco and stashed her husband's cellphone, a handgun - not the same one used in the murder - and his coin collection, in her son's garage. After returning home, she called the lawyer who won her previous case and told him that she had shot her husband, prosecutors say. The lawyer then contacted the Sheriff's Office. El Dorado County Deputy District Attorney Joe Alexander said that Harris claimed she had been in a 'gray fog' but insisted she would never shoot her husband. She said she was in the same fog in 1985. She was acquitted in her 1986 trial after claiming she had acted in self defense when her husband, whom she was divorcing, held a pistol to her head, threatened to kill her and sexually abused her. Bob Harris's son Scott Harris weeps in relief and has to wipe his eyes when the guilty verdict was announced on Wednesday . Harris's other two children, Pam Stirling (left) and Andy Harris (right), are comforted by relatives after the guilty verdict was announced in court . Bob Harris's sister Nancy Glaiberman, wiped tears from her eyes as the guilty verdict is announced at El Dorado Superior Court on Wednesday . She said she couldn't remember killing him and a psychiatrist testified during the trial that she suffered from limited amnesia. The prosecution claimed, however, that she had shot her husband as he read a newspaper in bed and then killed him with another shot at close range, before putting a pistol in the bed to make it look like self-defense. She waited an hour before calling the Sheriff's Office. Two of Bob Harris's children, Andy Harris and Pam Stirling said that Wednesday's verdict brought needed relief. 'I wish the jury could have heard how wonderful he was,' Stirling told the Sacramento Bee. 'I think justice served will be a good start for our family to recover from this tragedy.' In the  case, prosecutor Joe Alexander said that Colleen Harris shot Bob Harris in a premeditated act because she knew he had called the woman he was having an affair with. Bob Harris worked in the Forest Service and as an instructor with the El Dorado Sheriff's Department. He was also an umpire for little league and minor league baseball . But the defense said that Bob Harris was upset at sending Stirling a text message that said, 'Between you and me, as I sit here wondering who I am married to, your dad just called his Mongolia love about 10 minutes ago'. Colleen Harris testified that she went into the couple's bedroom to comfort her husband when she saw the shotgun on the bed. She said she wrestled for the gun and then it gets grey. When she came to and turned on the light, she 'saw the most horrible thing', which was Bob Harris's dead body. After the killing, she made a trip to San Francisco and returned to try to wipe Bob Harris's blood off the ceiling before calling the police. Sterling said that her father was 'very unhappy in the marriage' and she was glad the jury acknowledged that Colleen Harris's actions were cruel. 'When someone wants to break away from another person, it seems that the other person can make a decision other than to kill him,' she said. In 1985, Colleen Harris shot her second husband dead in the same house that Bob Harris was murdered at in 2013 .
Colleen Ann Harris was found guilty of first-degree murder for shooting dead her third husband, Bob Harris, in their bedroom in 2013 .
In 1985, she shot her second husband, James Batten, 46, but was acquitted after claiming she acted in self defense and couldn't remember killing him .
The two killings took place in the same home, with the same type of gun, during marital problems and she said she had amnesia after both .
Prosecutors say she shot dead Harris, from whom she was separated, after hearing him making a call to a love interest .