(Adds quotes from father, Al Sharpton; rewrites throughout)
By Carey Gillam
FERGUSON, Mo., Aug 12 (Reuters) - The father of an unarmed black teenager who was shot to death by police over the weekend in a St. Louis suburb made another plea on Tuesday for an end to the violence that has followed the incident, while activists demanded authorities release the name of the officer involved.
Standing with supporters, including the Rev. Al Sharpton, the father of 18-year-old Michael Brown said he wanted justice for his son but wanted it "the right way."
"I need all of us to come together and do this right, the right way," said Michael Brown Sr., who wore a T-shirt showing his son's baby picture. "No violence."
Activists speaking to reporters in downtown St. Louis also called for federal authorities to take over the investigation.
Police in Ferguson, Missouri, had initially said they would release the officer's name on Tuesday, but changed the plan, citing fears of retaliation, according to media reports.
Sharpton, a New York-based civil rights leader, also called for peaceful protest in the wake of looting and more than 50 arrests since the shooting. Sharpton's National Action Network will pay for Brown's funeral.
"To become violent in Michael Brown's name is to betray the gentle giant that he was," Sharpton said of the 6-foot, 4-inch (198-cm) Brown, who had planned to start college this week. A demonstration is planned at a Ferguson-area church on Tuesday evening.
Brown was shot to death in the back of a police car on Saturday, police said. The race of the officer, a six-year veteran who is now on administrative leave, has not been revealed.
The FBI has opened a civil rights investigation into the racially charged case and St. Louis County also is investigating.
Police said Brown was shot in a struggle with a gun in the police car but have not said why Brown was in the car. At least one shot was fired during the struggle and then the officer fired more shots before leaving the car, police said.
But a witness to the shooting interviewed on local media has said that Brown had been putting his hands up to surrender when he was killed.
"There were many, many witnesses who have talked to family members and they paint a very different picture than police witnesses," said Benjamin Crump, an attorney for the Brown family. Crump also represented the family of Trayvon Martin, an unarmed black teen killed in Florida by a neighborhood watch volunteer in 2012.
The "hands up" gesture has been frequently seen at protests over the shooting. More than 100 protesters in front of the St. Louis County Courthouse in nearby Clayton on Tuesday morning chanted "hands up, don't shoot."
Residents in the low-income, mostly black neighborhood where Brown was killed say they are often harassed by police. Ferguson Police Chief Tom Jackson said the neighborhood had a lot of crime but there were no race problems.
Demonstrations on Sunday night turned violent, with looting and property damage. Violence broke out again on Monday night as police officers in riot gear, armed with rifles and accompanied by dogs tried to secure the area.
The area has seen a stark demographic shift in recent decades, going from all white to mostly black. About two-thirds of Ferguson's 21,000-strong population are black, while out of a police force of 53, three officers are black.
The race of officers should not matter as long as their work is fair and professional, said Dave Klinger, a former police officer and criminal justice professor at the University of Missouri-St. Louis.
"If the officer behaved inappropriately, we've got to sanction the officer and figure out what it is that led him to do what he did," Klinger said. "Was he poorly trained? Was there a pattern in this agency?"
Klinger said the investigation must be as "transparent as possible." (Additional reporting by Mary Wisniewski in Chicago; Writing by Eric M. Johnson and Mary Wisniewski; Editing by Susan Heavey, Bill Trott and Eric Walsh)