Daniel Crimmins (b. 1966; d. April 1998) was a computer security consultant in Los Angeles.
In 1993, he attempted to join the Los Angeles Police Department in order to follow in his father's footsteps, but washed out after five months for "failure to thrive in the collegial atmosphere of the academy."
In 1995, Crimmins began murdering people in Los Angeles, and became publicly known as the Code Killer based on his habit of mailing letters to FBI profiler Terry McCaleb, who headed the Code Killer task force, including the code "903 472 568."
On 2 December 1997, Crimmins shot and killed Donald Kenyon in his home after waiting for Kenyon's wife to return home, but the frangible bullet he used killed Kenyon instantly, rendering his organs useless. On 22 January 1998, Crimmins shot and killed James Cordell at an ATM, then called 911 under the guise of "James Noone," but the ambulance dispatcher transposed two numbers of the address of the convenience store, and Cordell died before medical help could arrive.
On 9 February 1998, Crimmins called 911 to report a shooting that he then committed himself thirty seconds later when he shot and killed Gloria Torres and Chan Ho Kang. He fled the scene of the shooting, and returned moments later wearing a disguise in order to ensure that Torres survived until the ambulance arrived. Torres made it to the hospital before expiring, and her organs were harvested for transplant, with her heart going to Terry McCaleb.
In April of 1998, Crimmins wrote a letter to Keisha Russell at the Los Angeles Times, inspiring her to write an article about McCaleb's post-operative progressive. Crimmins then called Graciela Rivers, posing as a co-worker of Gloria's, and mentioned the story to her, inspiring her to seek out McCaleb and request his help in closing the investigation in Torres's murder.