Delagnes, who has won handily in past elections, failed to get a majority of officers voting. The tally showed Delagnes with 747 votes, Steve Landi with 478 votes and, in third place, John Evans with 473 votes.
Delagnes will now have to face Landi in the runoff slated for later this week.
One veteran cop told ABC7 he cannot remember a more hotly contested election for police union head.
Some rank and file officers tell us Delagnes appeared to be "too close" to former Police Chief George Gascon, who recently was appointed interim District Attorney following Kamala Harris's move to state Attorney General. Although popular with the public, Gascon, who was with the LAPD for many years, was still viewed by some rank and file officers as "an outsider."