As mortally wounded NYPD cop Wenjian Liu lay in a Brooklyn hospital in 2014, doctors asked his stricken wife if she wanted his semen preserved so that she might someday have his child.

“Of course she said yes,’’ a friend told The Post — and Tuesday, two-and-a-half years after Liu’s murder, his widow gave birth to their daughter.

Liu’s widow, Pei “Sanny’’ Xia Chen, named the baby “Angel’’ as a tribute to her slain hero husband — whose police hat is now next to her bed at New York-Presbyterian Hospital on the Upper East Side, said the pal, fellow cop widow Maria Dziergowski.

The day Chen was artificially inseminated, “she had a dream that Wenjian was there in a white gown looking like an angel and that he handed her a baby, and he said, ‘It’s a girl, a little angel,’ ’’ Dziergowski said.

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“So [Chen] knew before everyone that it was a girl.

“The baby’s adorable, smiling, laughing,’’ added Dziergowski, who was with Chen at the hospital Tuesday. “She has a lot of hair, a lot of black hair.’’

Chen — who had only been married to her policeman husband for three months before he and his partner were killed in an ambush by a cop-hating madman — was admitted to the hospital around 12:30 p.m. Monday and gave birth at 4:35 a.m., Dziergowski said.

The baby, whose full name is Angelina, weighed 6 pounds, 13 ounces and is 19.5 inches long, Dziergowski said.

Sources said the baby’s birth was particularly poignant for Liu’s parents, who lost their only son, 32, in the double murder.

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