A volunteer community watch captain who shot an unarmed Florida teenager to death last month had been the subject of complaints by neighbors in his gated community for aggressive tactics, a homeowner said.

George Zimmerman has not been charged in the Feb. 26 shooting of Trayvon Martin, 17, who was walking home from a convenience store in Sanford, Fla., near Orlando. Zimmerman, who patrolled the Retreat at Twin Lakes development in his own car, had been called aggressive in earlier complaints to the local police and the homeowner's association, according to a homeowner who spoke on the condition of anonymity.

At an emergency homeowners association meeting on March 1, one man was escorted out because he openly expressed his frustration because he had previously contacted the Sanford Police Department about Zimmerman approaching him and even coming to his home, the resident wrote in an email to HuffPost. It was also made known that there had been several complaints about George Zimmerman and his tactics" in his neighborhood watch captain role.

The meeting was attended by Sanford Police Chief Bill Lee, the detective assigned to the investigation and an unnamed member of the city council, according to the homeowners association newsletter. The chief couldn't immediately be reached for comment about the complaints. A member of the homeowners association board, who asked not to be quoted by name, said she hadnt heard about any complaints about Zimmerman. Zimmerman's phone number is disconnected and efforts to reach him have been unsuccessful.

Talk of prior complaints against Zimmerman comes as pressure mounts on law enforcement. Protesters have gathered outside Sanford police headquarters. The Martin's family and attorneys have held press conferences calling the killing an outrage and pleading for Zimmermans arrest. High school classmates and citizens are granting interviews to reporters asking why no one has been charged. And as the story continues to gain national media attention, civil rights leaders, including members of the NAACP and the Rev. Al Sharpton, said they are preparing to join the family of Martin, who was black. Zimmerman is white.

This case is disturbing to say the least, Sharpton told Huffpost. This is appalling, to think that this guy admitted to initiating the conversation and that there was no crime other than the killing of this young man. Yet, [Zimmerman] is walking around with no threat of an arrest.

Sharpton said he will travel to Florida this week.

Zimmerman called police the evening of the shooting to report Martin as a suspicious person, police have said. A dispatcher told Zimmerman to stand down and an officer was on the way. Zimmerman confronted the youth anyway and Martin was shot in the chest with Zimmerman's 9 mm pistol, police said. Police questioned Zimmerman, then released him.

According to Martins family, police initially told them that Zimmerman said he acted in self-defense and that his record was squeaky-clean. Public records show he was arrested in Orange County in 2005 on charges of resisting arrest with violence and battery on a law enforcement officer. Those charges were later dropped.

Benjamin Crump, the Martin familys attorney, filed a public records lawsuit last week seeking the 911 recordings for the night of the shooting. Crump said people with access to the tapes told him Zimmerman made a comment about Martins race during the call and said he had no intention of letting the youth get away because, they always get away.

I dont think they have any intention on arresting this white man for killing this black boy, Crump said on Sharptons radio show Monday.

Chief Lee said during a Monday afternoon news conference that his departments investigation should be concluded by Tuesday and delivered to the Seminole County State Attorneys Office. Lynne Bumpus-Hooper, a spokeswoman for the State Attorneys Office, said once the case is handed over it will be thoroughly digested and we will make decisions.

Protestors jeered Lee during the news conference when he said he does not believe his investigators have enough evidence to charge Zimmerman in the killing, according to local news accounts. Lee said that he believes that we can get through all the ugly thoughts and all the disagreements and all the ill will and hard feelings and truly come together as a community.

It is with that thought that we want to make sure that we due a fair and complete and thorough investigation so that we can reach some form of justice with this event, Lee said. He added that there is the right for someone that has a concealed weapons permit to carry that weapon and that police support the neighborhood watch program.

In this case Mr. Zimmerman has made the statement of self defense," Lee said. "Until we can establish probable cause to dispute that, we dont have the grounds to arrest him.

One person shouted, "The black community sees your department protecting the shooter," and "a little black boy is dead."

Martin, a high school junior, who had hoped to go to college and become an aviation mechanic, his family said. He lived with is mother in Miami and was visiting his father and his fathers fiance in Sanford the weekend he was killed. During the NBA All-Star Game, he walked to a nearby store to get candy for his little brother.

Arriving police found Martins 140-pound body face-down in a patch of grass less than 100 feet from his familys home. The young man was unarmed, with a few dollars and a pack of Skittles in one pocket and a canned iced tea in the other.

He was a typical teenager, he loved life, Tracy Martin, the teens father, said. But now, all the family wants is justice.