U.S. Army representatives provided an update Monday on the condition of Fort Hood and the victims of last week's deadly shooting as well as new details from the ongoing investigation into what happened.
One of the soldiers Specialist Ivan Lopez shot was 32-year-old Sergeant Jonathan Westbrook. He works in the building where the shooting began and told his family Lopez had an argument with a supervisor over a leave form.
Westbrook later described what happened next to Mississippi CBS affiliate WTVJ.
"[Lopez] didn't like the information that was told to him, so he became irate," Westbrook said. "He then left after the meeting was over with, and I guess he went to get his weapon and he came back and fired shots.
3 soldiers were killed: 38-year-old Carlos Lazaney, from Puerto Rico, 37-year-old Sergeant Tim Owens, from Illinois and 39-year-old Sergeant Daniel Ferguson from Florida.
Westbrook was hit four times but is out of the hospital. Now investigators are confirming the story he's been telling.
"At this point in the investigation we can confirm that the alleged shooter, Specialist Ivan Lopez, was involved in a verbal altercation concerning his request for leave," the U.S. Army Criminal Investigation Command's Chris Gray said.
Investigators went over the path Lopez took, starting with that administration office and the fight that broke out. From there he got in his car and started driving.
One of his stops was a medical building.
"The subject allegedly shot and killed a soldier who was on duty at the main entrance desk and wounded an additional soldier," Gray said. "At this point we do not know why he entered that building and we may never know why."
Col. Paul Reese, Three Corps' Chief of Current Operations, described three priorities going forward: completing the investigation, insuring safety on the base, and caring for the victims.
"Eleven of the sixteen injured have been returned to duty so far," Reese said. "Five remain hospitalized in the local area."
Of the five still hospitalized Monday, three were listed in fair condition. Updates for the other two were unavailable.
A memorial service has been set for 2pm Wednesday at Fort Hood.
CBS News Correspondent Anna Werner contributed to this report.