SAGINAW -- An Arlington officer and the teenage suspect in the sexual assault and murder of six-year-old Alanna Gallagher were each shot as authorities served a capital murder arrest warrant Tuesday morning.

Det. Charles Lodatto was shot in the groin area while assisting authorities at about 9 a.m. Tuesday in the doorway of 17-year-old Tyler Holder's home, authorities said. According to a Harris Methodist Hospital doctor, a tourniquet was applied to the detective's wound at the scene, which was something the doctor said likely saved the detective's life.

An arrest warrant released Tuesday afternoon says that lab tests showed DNA found at the crime scene matched that of Holder, who lives at a home two houses down from the Gallaghers in the 600 block of Babbling Brook Dr.

According to Katherine Chaumont, a spokeswoman with the Dallas FBI office, authorities present at the time of the shooting included Saginaw police, the FBI Safe Streets Task Force and the North Texas Major Case Investigative Team.

Officers engaged the suspect at the door, Chaumont said. An altercation ensued, the suspect produced the weapon and shots were fired.

A neighbor said she heard three shots fired.

I heard 'pow,' and then there was a pause and I heard 'pow, pow,' said Janice Hobbs.

Chaumont said an FBI task force member, identified later as Lodatto, was injured in the shooting. The suspect was struck as at least one officer returned fire, the spokeswoman said.

Lodatto was transported to Harris Methodist Hospital, where he underwent surgery and is listed in serious condition. In a news conference at about 3 p.m., a surgeon said the detective could have bled to death in less than 10 minutes without the treatment to his femoral artery by first responders at the scene.

More medical test are needed but things are very optimistic, said Arlington Police Chief Will Johnson on Twitter. Family is grateful for the support.

Lodatto is a 21-year veteran with the Arlington Police Department and was named detective of the year in 2012.

Several sources said Holder suffered a critical wound to the head and was transported to JPS Hospital.

In an earlier interview with WFAA, Holder said he gave police a statement in relation to the Gallagher case.

Yolanda Sierra, a neighbor, said she saw Holder wearing a T-shirt that read Wanted at a memorial service for Alanna.

I though to have a Wanted shirt on was inappropriate, she said. It's a memorial service and you show up with a Wanted T-shirt? It made me uneasy. Big red flag.

On July 1, two teenage boys found the body of Alanna bound and gagged inside a tarp abandoned at an intersection in the family's neighborhood less than one mile from their home.

On July 19, authorities investigated a car fire at the Gallagher home. Saginaw police said someone intentionally set a car belonging to Karl Gallagher, the young victim's father, on fire at about 2 a.m.

We're just very scared, said Laura Gallagher, Alanna's mother, to News 8 the day of the fire.

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