No on was injured in the gunfight, police said.
Police are looking for a gray sedan in connection with the shooting, officials said.
The Coast Guard sent a helicopter to airlift the two men from the barge and transported them to an airport in Houston.
Chad Ealey, 38, was found dead on a Seawall beach earlier this month.
Manuel Lopez Vargas initially was charged with continuous sexual abuse of a child under 14 and indecency with a child by sexual contact, but a jury found him guilty of the lesser-included offense of aggravated sexual assault on the first charge.
After Wednesday's plea agreement, at least two of the four arrested have pleaded guilty.
The victim was hit in the face but managed to take down his alleged attacker, according to police
Investigators found a car with bullet holes in it and shell casings around it, officials said.
The body of Joshua Nicholas Branch, 35, was found Saturday morning by an oilfield worker.
Police also responded to a double stabbing in downtown Galveston on Saturday evening.
The crash is the first confirmed motorcycle fatality during this year's Lone Star Rally.
Nearly 100 bikers were told to leave a party at Pirates Beach.
Police allege the man made threatening comments before he was arrested.
Throughout the day Thursday, over-the-air traffic on local police channels squawked with descriptions of riders wearing gang colors.
The woman was charged with a felony for causing a false alarm at a public building, police said.
The man's body was found near the bottom of a set of stairs.
One of the men was wearing a mask like the one in the movie, “Scream” and the other was wearing a hoodie and a blue bandana covering his face, police said.
The crash happened just before 7 p.m. at Santa Fe High School.
The man is in a hospital in critical medical condition, police said.
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