On TikTok it looked like a storybook romance, including a recent marriage proposal. But now cops are looking for the on-the-lam fiancé of 38-year-old Angelique  Sasha  Apostol after she was shot in the head and left to rot in his Queens apartment.

Apostol's badly decomposed body was found with a gunshot wound to the head inside her 55-year-old fiancé Mark Washington's house on 205th St. near 113th Road in St. Albans around 2 p.m. on June 24, two weeks after her death, according to police and the Medical Examiner's Office.

On Tuesday, the NYPD named Washington as a suspect, released photos of him and asked the public's help tracking him down.

Apostol, who lived in Staten Island, was only found in her fiancé's home after neighbors complained of a foul odor, her sister said.

 We weren't even allowed to have an open casket,  the sister, Melanie Apostol, 37, told The News.  Because he left her to rot, her hand wasn't even solid enough for them to show it to me. 

 I had to identify her through the tattoos of my children's names  that were on her body, she added.

Angelique and Washington, 55, started talking online late last year, connecting through mutual friends. Both were originally from Staten Island. In February, Angelique posted on TikTok that they were engaged, with the song  Right Here Waiting for You  playing in the background.

But in private, she shied away from discussing her relationship, her sister and friends said.

 She told me that they were engaged, but not too much, maybe because she didn't want me to worry,  Melanie said.

 I'm still in shock,  said Angelique's best friend since second grade, Kendra Smith.  I would never expect this would happen to her. She didn't tolerate domestic violence. I was always the one in a domestic violence relationship and she would always tell me to end it … I can't believe this happened. 

Angelique even worked for a time as a domestic violence counselor at a shelter in Schenectady, N.Y.

 I don't think she realized that she was dealing with a dangerous person,  Smith said.  I really think she was blinded. I feel like he manipulated her be

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