Police today identified the suspect as 21-year-old Maurice Vernon who has ties in Vallejo and Sacramento.
Vernon should be considered armed and dangerous, Lt. Ken Weaver said.
He is a member if the Oak Park Bloods gang out of Sacramento and has prior convictions on weapons, theft and assault with a deadly weapon charges, Weaver said.
Police arrested a second suspect in the Sept. 3 rape, Donshay Nichols, 18, on Jan. 18, Weaver said. Nichols' preliminary hearing on the rape charge is scheduled for March 5 in Solano County Superior Court.
The Vallejo woman, who was returning from a day trip to San Francisco on Sept. 3, was within sight of her car in the Vallejo Ferry overflow parking lot behind City Hall at 555 Santa Clara St. when two men grabbed her, Weaver said.
One of the men held a gun to her head and demanded jewelry and money, Weaver said. When she said she had no money, the suspects forcibly removed the rings from her fingers and tried to take her bracelet, Weaver said.
The suspects also took her wallet from her purse and after discovering her driver's license, told the woman they now knew where she lives and she had 'better not say a word about this or report this to anyone', Weaver said.
The suspects then forced the woman into her car, threatened to kill her and sexually assaulted her, Weaver said. The suspects then read back her name and address and threatened to kill her and her family if she told anyone about the robbery and assault, Weaver said.
Vernon also is a suspect in an assault of a 60-year-old homeless woman in Vallejo in December, Weaver said. The woman was severely beaten and was in the intensive care unit of a hospital for weeks, Weaver said.
Vernon also is suspected of robbing and carjacking a 20-year-old Vallejo man in September, Weaver said.
The Solano County District Attorney's Office has filed a complaint against Vernon regarding the December assault of the homeless woman and also is reviewing a robbery in April that Vernon is suspected of committing in Vallejo, Weaver said.
"We're looking for him and we need the public's help," Weaver said this afternoon.
Vernon was described as a black man, about 5 feet 6 inches tall and 150 pounds.
Police are asking anyone with information about Vernon to call Detective Drew Ramsey or Detective Todd Tribble at (800) 488-9383.