Workers ratified a new contract with Kroger after walking off the job on Jan. 12.
More than 80 stores are involved in a walkout at the Kroger-owned chain.
Ahwad Al Aliwi Alissa's attorney said Friday her client has a “serious” mental illness but did not provide more details.
Ahmad Al Aliwi Alissa bought the weapon on March 16, just six days before the attack at a King Soopers store in Boulder.
Ten people between the ages of 20 and 65 were killed during a shooting at a King Soopers grocery store in Boulder, Colorado.
Ten people, including a police officer, were killed when a gunman opened fire at a King Soopers store in Colorado on Monday.
The father of seven, a Boulder officer since 2010, was the first to respond to reports of gunfire at the mass shooting scene.
"This feels like the safest spot in America and I just nearly got killed for getting a soda, you know, and a bag of chips."
Ahmad Al Aliwi Alissa, 21, is accused of fatally shooting 10 people, including a police officer, at a King Soopers store in Boulder.