The book, which details Hartfield's career as a police officer in Las Vegas, says he worked in law enforcement for 11 years and on active military duty for 16 years.
Jennifer Irvine was shot and killed when a gunman opened fire from the 32nd floor of the Mandalay Bay Hotel and Casino, said Jay Jones, Irvine's publicist.
Sunday's shooting killed 58 people and injured more than 500 others.
Jones told NBC 7, Irvine was a smart, charming and driven person.
Denise Burditus' Facebook page includes a photo of her and her husband at the same festival past year.
San Diego Fire-Rescue Chief Brian Fennessy said several of his off-duty firefighters were in Las Vegas attending the concert as well. The other wounded officer suffered minor injuries.
But it is unclear how numerous firefighters were at the concert.
Sgt. 1st Class Charleston Hartfield, 34, was serving in the Nevada Army National Guard and was a Las Vegas Metro police officer when he was killed at the Route 91 Harvest Festival, according to the National Guard. The shooter was identified as Stephen Paddock, 64, of Mesquite. There were about 18 rifles in the room.