GRAND JUNCTION, Colo. -- More than 400 people attended a memorial service for a retired Grand Junction teacher who was shot and killed a week ago for reasons that still haven't been explained.

Sixty-year-old Floyce Gallagher was remembered Saturday as a tough but dedicated teacher who chose to help struggling high school students. Friends also recalled her irreverent wit.

Gallagher was a teacher at Grand Junction High School with an insatiable passion for reading, reported KJCT. She loved reading "Where the Wild Things Are" and "The Giving Tree" to her students.

She had just retired from teaching last Friday. "She stuck with the kids that were struggling. Many of those students who were struggling are now successful," Jim Fleming, Mesa State Trustee and family friend, told KJCT.

A special bookmark was passed out in her memory at the service. Her close friends wore shawls she had given them as gifts from her trips around the world with her husband.

Gallagher and dentist Terry Fine were killed Oct. 11 in Fine's driveway as they were leaving on vacation with their spouses. Fine's wife, Linda, and a neighbor were wounded.

Police identified the shooter as 22-year-old Stefan Alexander Martin-Urban, who committed suicide. Investigators haven't disclosed a motive.

Martin-Urban was an Alaska native who was staying with a relative in the Denver suburb of Lakewood.