Deirdre Fonseca, left, trains as her two daughters eat ice cream. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca is joined by her daughters, ages 7 and 8, while training. (Gary Coronado / Los Angeles Times)
Once a civilian dispatcher, Deirdre Fonseca became an LAPD officer, later working a gang-enforcement detail at the Foothill Division. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca, center, talks with fellow LAPD officers during a training session at the City of Angels Boxing gym in Los Angeles. (Gary Coronado / Los Angeles Times)
Making cookies with daughters Violet and Demi at their home in Sunland. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca with daughters Violet and Demi. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca and Claire Hankinson, a British police officer, square off after weighing in for their match in Los Angeles. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca stretches before her match against Claire Hankinson in Montebello in July. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca gets ready for a match against L.A. County Sheriff’s Deputy Destiny Moreno. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca, right, and Destiny Moreno trade punches at their Nov. 17 match. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca, left, is declared the winner by unanimous decision over Destiny Moreno. (Gary Coronado / Los Angeles Times)
Deirdre Fonseca greets fans after her victory. (Gary Coronado / Los Angeles Times)
