New clues in decade old cold case

STUART, Fla. - Lt. John Silvas with the Martin County Sheriff's Office remembers how the body of Theresa Doyle was found back in February of 1999.

"The way she was bound and the cement block on her. It was like she was trash, it was nothing to somebody to do that," said Lt. Silvas.

The 35 year-old mother of two from West Palm Beach was scheduled to take the stand against the man charged with raping her. But before she could testify, Doyle's body was found floating in the St. Lucie River.

"I have a lot of sleepless nights," said Doyle's sister Kristie. She spoke a few weeks ago when it was learned that the "America's Most Wanted" television show was going to profile the Doyle case.

"We really want to bring him to justice," said Kristie Doyle.

She was referring to Angel Benitez Colon, Doyle's live-in boyfriend.

Investigators used new technology to figure out that Colon wasn't who he said he was. Detectives knew for years that Colon was living under an alias. Working with special software from the Palm Beach County Sheriff's Office, it's now been determined Colon was actually Lazaro Arango who was tracked down last week in New York by federal marshals. Arango, who is only classified now as a person of interest, was the last person seen with Doyle.

Now Lt. Silvas has a new avenue to investigate. "We start a new perspective on the investigation. Did some background checks on him and see who he was. Get an idea of the man who was Lazaro Arango."

The Doyle case was only the second from Martin County ever to be aired on "America's Most Wanted." Silvas says he's gotten a number of new leads already from both here and around the country. He's waiting for the opportunity to interview Mr. Arango face to face.