DALLAS — Twenty-one-year-old Jacques Smith is accused of killing two sisters at Texas A&M University-Commerce on Monday. This comes one week after he was charged with assaulting one of the victims. 

On Wednesday, police also linked Smith to a robbery and murder from New Year's Eve in Denton. 

RELATED: Alleged killer of 2 women at Texas A&M-Commerce also linked to New Year's Eve slaying, police say

Smith has a history of violence:

January 2018: Documents show he pleaded guilty to aggravated robbery and evading arrest. Smith was still on probation for those crimes.

January 27, 2020: Smith was charged with aggravated assault on his ex-girlfriend, Abbaney Matts. The incident allegedly happened in Garland. 

Matts told police Smith entered her home while she was sleeping, wanting to talk about their relationship after Matts wanted to break up. "Matts stated that Smith refused to leave and picked up a glass lamp and broke it over her head." She also told police he threw a box fan and a television at her before he body slammed her to the floor. The affidavit states, "Smith then proceed[ed] to hit her on the head with a metal frying pan several times." She also told police he held a knife over her, threatening to kill her before her brother arrived to stop the assault.

RELATED: Father of sisters who were killed in Texas A&M University-Commerce dorm room says they were best friends

An emergency protective order was completed for Matts and her 2-year-old son. 

January 29, 2020: Smith's bond was set at $15,000.

Smith bonded out.

January 31, 2020: A Dallas County court issued two warrants on Smith for violating his probation.

February 3, 2020: Around 10:15 a.m. Abbaney Matts and her sister, Deja Matts, were found shot to death at a Texas A&M University-Commerce dorm. Abbaney's toddler was shot in the foot and injured.

February 4, 2020: Smith was arrested on a capital murder charge in the university shooting. The father of the sisters told WFAA that Abbaney was dropping Deja off at school after a family gathering.

RELATED: 2 women killed, toddler injured in shooting at Texas A&M University-Commerce residence hall

Deja was a freshman living at Pride Rock Residence Hall at TAMUC. Abbaney did not attend the school.

The warrant states Smith was seen leaving the dormitory at 8:44 a.m. on the day of the murder. He was seen leaving the campus in a black Hyundai Sonata.

Smith is in custody on a $1 million bail.

February 5, 2020: Denton Police said Smith is connected to the murder of Steven Daniels on New Year's Eve in Denton. Investigators found evidence at his home while searching for evidence for Abbaney and Deja's deaths. 

Two others, 23-year-old Jalin Hargrove and 26-year-old Earnest Rogers, were also arrested in connection with the New Year's Eve slaying. 

All three suspects are charged with capital murder.

WFAA spoke to an attorney and former prosecutor, George Milner about these charges. He is not on this case, but believes Smith's past behavior should have been a sign. 

Milner believes the $15,000 bond after the aggravated assault was not enough. 

"The reality is that there are so many people in the system that you miss people sometimes," said Milner. "It's difficult to believe this guy slipped because he really had some major red flags on him."