DENVER -

The ex-stepmother of a white supremacist who gunned down six people at a Sikh temple in Wisconsin remembers her son as a "gentle, kind, loving child, little boy and teenager."

Laura Page said she was Wade Michael Page's stepmother. The 67-year-old from Denver said Page was 10 when she married his father, Jesse Page.

Page said Monday that both she and Jesse Page, who are now divorced, are devastated by the actions of their son. She said, "I loved him. He was a precious little boy and that's what my mind keeps going back to."

Police shot and killed Wade Michael Page on Sunday to end his rampage at the Sikh Temple of Wisconsin. Three people critically injured in the shooting remain hospitalized.

FBI said it's investigating the Sunday shooting as a possible act of domestic terrorism but doesn't know a motive at this time. The Southern Poverty Law Center civil rights group has identified gunman Wade Michael Page, 40, as a known white supremacist.

A senior fellow at the Southern Poverty Law Center told CBS News that Page was a member of several white supremacist rock bands and the music often referred to genocide against Jews and minorities.

ATF Special Agent in Charge Bernard Zapor said Page used a legally purchased 9mm handgun and multiple ammunition magazines in the shooting.

Page, a Colorado native, lived in North Carolina from 2007 to 2011. He was a U.S. Army veteran.

Oak Creek Police Chief John Edwards said Monday that authorities in suburban Milwaukee didn't have any run-ins with Page before Sunday's shootings. The shootings ended when Page was fatally shot by police.

Wade Michael Page's family sent a statement via text message to a Milwaukee Journal Sentinel reporter.

The family said it's devastated by Sunday's events and that "while there can be no words of comfort that will make sense of what happened that day, please be aware that our thoughts and prayers go out to all the victims and their families. We share in their grief for all those who lost their lives that day and for those survivors, we hope for a speedy recovery."