GARLAND -- Colten Moore, the 18-year-old suspect in the murder of a Garland 7-Eleven clerk has been linked to a second shooting.

Moore admitted to police he shot another clerk at the Homeboys gas station on Jan. 16, according to Garland Police Spokesman Joe Harn.

Harn said at 11:40 p.m. that night, a clerk at the gas station in the 2500 block of Firewheel Parkway stepped out of the store and walked towards his car. He was shot twice by someone he never saw. He told police he had no idea who shot him or why he was shot.

The Homeboys clerk was able to get back into the store and get help. He was taken to Medical City of Plano.

The Homeboys clerk's injuries were consistent with a small-caliber weapon, and Harn said evidence recovered at that scene connects Moore to the Jan. 16 shooting.

Another clerk at Homeboys said the staff was 'very relieved' to hear they had made an arrest in the case.

Moore was arrested Wednesday and charged in the death of Yosef Tulu, who was killed during a robbery. According to police, a delivery man found Tulu's body early Tuesday morning. Authorities said officers watched the masked suspect 'enter the store with a scoped rifle' in surveillance video obtained at the scene.

Homeboys is located across the street from the 7-Eleven where the murder occurred Tuesday night on Firewheel Parkway.

Thursday afternoon, Colten Moore was escorted by deputies to the Dallas County Jail.

Those who know Moore were surprised to hear of his arrest after the murder.

'It did kind of make sense, but at the same time, you would never believe a kid you went to high school with and daycare with would do something like that,' Josh Scerna said.

Serna and Moore graduated from Naaman Forest High School last spring.

'He would threaten people's lives in a jokingly way, and he got away with it most of the time,' Serna said. 'No one really took him seriously.'

This fall, Moore enrolled at Richland College in Dallas. On his Facebook page, he said he studied graphic design. College administrators say he is not a student there this semester.

Also on his Facebook page, it appears Moore posted a story about the murder on his page just hours after the crime, without any comment.

About 200 people attended a vigil held for Yosef Tulu Thursday night outside the 7-Eleven where he was killed.

'What happened in there Tuesday should never have happened -- you know that, and I know that,' one mourner said to the crowd.

Detectives are preparing a second charge of aggravated assault against Moore for the Jan. 16 shooting.

[Ed. note: The initial version of this story had Moore listed as 17 years old. He is in fact 18. We apologize for the error.]

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