The verdict brings to an end a nearly three-month trial featuring the testimony of more than 50 witnesses, including Grim Sleeper survivor Enietra Washington, who testified that Franklin shot her, sexually assaulted her, and took a Polaroid picture of her before pushing her out of his car 27 years ago.
The penalty phase of the trial will begin May 12.
Franklin, a married father of two and former LAPD mechanic and sanitation worker for the city of Los Angeles, was charged with the murders in July of 2010.
Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter.
Most of Franklin's victims were shot with a .25-caliber pistol while others were strangled. Their bodies were discovered in dumpsters and alleyways along Western Avenue in South Los Angeles, an area known for its cheap motels, liquor stores, gambling parlors, auto salvage yards and storefront churches.
His murder spree began on Jan. 15, 1984, when Sharon Dismuke was discovered fatally shot in the chest in the restroom of an abandoned gas station.
The last known murder occurred on January 1, 2007, when 25-year-old Janecia Peters's lifeless body was discovered in a dumpster. Peters had been shot in the lower back, paralyzing her from the waist down.
"She couldn't run away," said prosecutor Beth Silverman during closing arguments Monday. "She couldn't escape. This particular victim spent several minutes gasping for breath. It was an agonizing way to die."
Prosecutors portrayed Franklin as a opportunistic killer who hunted for his victims in the same area in which he lived and worked. The majority of his victims were found within a few miles of where Franklin lived.
"He is a serial killer who was basically hiding in plain sight," Silverman said. "He blended in. All evidence points to one person as the killer."
Silverman said Franklin was a "sexual predator," who killed women who "weren't submissive enough."
"These crimes were about power and control," she told the jury. "It is clear the defendant got pleasure from killing these young women because that's how they all ended up. He definitely wanted to degrade these women by dumping their bodies like trash. He got off on that too and that is why he did it over and over. It gave him gratification."
During closing arguments, Franklin's defense attorney Seymour Amster suggested that a "mystery man," possibly a "nephew" or someone who referred to Franklin as his "uncle," was the real culprit.
"Each and every murder in this case could have been done by a mystery man with a mystery gun with mystery DNA," he told jurors.
Immediately After Verdict, Mother of Victim Says: 'God is Good'As the consecutive guilty verdicts were being read, family members began breaking down and crying. Meanwhile, Franklin stared straight ahead, expressionless.
Immediately after the verdicts were read, Mary Alexander, whose daughter Monique was killed in September of 1988, said, "God is good."
In the hallways afterwards, victims' family members were hugging and crying.
Porter Alexander, Monique's father, said, "It is so unbelievable an individual could be so cold and uncaring. It immobilized us and crippled me. He took my baby . He took a limb from me."
Porter said Franklin deserves the death penalty, saying, "An eye for an eye. He deserves no less than he gave my daughter."
Irene Ephriam, the niece of Franklin victim Henrietta Wright, said, "It is closure. It has almost been 30 years. It hurt our family to lose her. It destroyed our family. None of us can get our families back. I was one of them who had to identify her body."
Detective Daryn Dupree, the lead investigator in the case, said, "It was a long time coming. It was very important that justice was done. I'm s relieved for the community and family."