Mr Samson was charged with the murder of 39-year-old Melanie Smith, of Smyrna, who was found dead in the auto park near the suspect's vehicle.
During an altercation, the gunman shot himself.
One person is dead and eight others are injured after a man in a ski mask opened fire as a Church of Christ in Antioch, Tenn., concluded its Sunday worship.
Samson, 25, came to the United States from Sudan in the 1990s and is a legal USA resident.
Authorities say the gunman had pulled up to Burnette Chapel Church of Christ, exited his vehicle, and shot a woman in the parking lot.
Police have not been able to determine the motive behind the shooting, but Samson has been undergoing treatment at a local hospital and has been allowed to go home. The usher - who goes by the name Caleb - confronted Samson after he entered the church and opened fire, preventing him from causing further damage. She was fatally wounded and died at the scene. "There's no understanding hate". Engle was pistol-whipped by Samson while trying to stop the gunman as he entered the church.
In an interview outside the church, Vickey Merritt said her husband had been inside during the shooting but escaped unharmed.
Trump is driving Pakistan into China's arms
The Afghan president also said be believes Trump's strategy has a better chance of success than Obama's. Trump also spoke highly of his Afghan counterpart.
Inside church member Minerva Rosa said everyone was talking about the success of their yard sale the previous day when they heard gunshots.
Don Aaron, a spokesman for the Metropolitan Nashville Police Department, said Samson drove up to the church and shot and killed a woman who was standing near her vehicle in the parking lot.
Nashville Police Chief Steve Anderson said of Engle on Sunday afternoon: "He's the hero - he's the person who stopped this madness".
- Senator Bob Corker (@SenBobCorker) September 24, 2017The shooting today at Burnette Chapel Church of Christ is a bad tragedy for our city.
Doug Ramey, 45, of Murfreesboro, Tennessee, said he met with Engle, the usher, at TriStar Skyline Medical Center, where he was being treated for injuries including a separated shoulder.
He also asked for people to pray for those who were affected by the shooting. "My grandmother hid under a church pew".
The trace would give authorities an indication of where the gun was purchased, who purchased it and whether it was purchased legally, the ATF representative said.
Catalans hit streets for independence
More than 70% of Catalans want a legal referendum on independence to settle the issue. Officials said 80% of them backed independence.
"He's just a great guy", Langford told the Tennessean.
He's tall, kind and considerate of others.
One patient at Vanderbilt University Medical Center is in critical condition, the hospital said.
The small, yellow brick church describes itself on its website as a "friendly, Bible based group of folks who love the Lord and are interested in spreading His Word to those who are lost".
There were 42 people inside the church, including a class of Sunday school children. Churchgoers said Samson used to attend Burnette Chapel Church of Christ more than a year ago, but officials are still piecing together what motivated the suspect to carry out this deadly rampage. "He is believed to have been there for at least several minutes before church let out", the police said in a statement. Shortly after Samson writes, "Become the creator instead of what's created. Whatever you say, goes", another read.
The next post read, "You are more than what they told us".
Police charged Samson Sunday night with one count of murder and said multiple charges were pending. According to CNN, he has been charged with felony homicide, although other charges will be released later, and is being held without bond. Among the survivors was Joey Spann, the church's pastor.
Ryanair offers pay rise to some pilots on top of bonus
The airline says it will cancel as many as 50 flights a day for six weeks because it "messed up" when scheduling crew holidays. Mr O'Leary again apologised for the disruption, which he said was down to mismanagement of the pilots' rostering system.