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MIAMI (CBSMiami) – Grieving relatives say a 4-year-old boy witnessed his mother’s murder inside their apartment and now Miami Police say they have a person of interest in this crime.

Police say they want to speak with 28-year-old Wilmer Samaron, who family members say is the father of the couple’s 5-month-old daughter.

Police responded to the apartment at 850 N.W. 4th Ave. after a call about a domestic disturbance at 5:30 Tuesday morning.

“It was just a murder,” said Douglas DeFord, the brother-in-law of the victim, who he identified as 33-year-old Socorro Tremino Delgado.

“It seemed like he was asleep and he killed her while she was asleep,” DeFord told CBS4’s Peter D’Oench. DeFord was at the crime scene and spoke with investigators.

CLICK HERE to watch Peter D’Oench’s report

“That’s why nobody heard any sounds because he used a pillowcase and shot her,” said DeFord.

“The children were there and the four-year-old boy, her son, he saw everything because he said the Dad was beating and strangling the Mom,” said DeFord.

He said Samaron and Delgado lived in the apartment with her four-year-old son and their 5-month-old daughter.

“Wilmer Samaron beat her sometimes,” said DeFord. “Not all the time, but that’s enough. She was trying to leave him because her suitcases were packed. It’s terrible. I don’t know why people kill people here in Miami.”

“Everyone has to take care of their family,” he said. “There are crazy around and you have to notice them and be careful.”

Reyna Luna, who is Delgado’s sister, was overwhelmed with grief at the crime scene.

She told D’Oench that her sister “was a very good person, a very calm person, a very sweet person. She was like a daughter to me.”

She said Samaron “was an aggressive, cowardly man. He would choke her, threaten her with a pistol and abuse her.”

“This is horrible,” said neighbor Brenda Soriano. “This is horrible. I have been living here for a month. I saw the mother’s sister walking over there and when she was told the news she started screaming and ran to police officers.”

Miami Police are not calling Samaron a suspect and say at this point he is just a “person of interest.”

“It’s still an ongoing investigation and we need to put the pieces together,” said Miami Police Sgt. and spokesman Freddie Cruz.

“We need to speak with this individual and if anyone has information please come forward so detectives can put this case together,” said Cruz.

“We ask that anyone who has seen anything to come forward.”

“We have a young lady who lost her life and that life was tragically taken away,” he said. “Now there are two children without a mother and that’s why this is important.”

DeFord said Delgado also had a third child: a 13-year-old daughter who was still living in Nicaragua.

A CBS4 news crew was at Miami Police headquarters as Delgado’s five-month-old daughter and 4-year-old son were taken from the police station across the street to the headquarters of the Department of Children and Families.

Cruz said DCF was working with family members to establish where Delgado’s children would be living. It’s expected that there will be a hearing on Wednesday to determine arrangements for their temporary shelter.

Miami Police said Samaron was last seen wearing a blue shirt and black pants and was driving a black Chrysler Pacifica with a Florida license tag of: DNZG 72.

Anyone who has seen that vehicle should call Miami Police of Miami-Dade Crime Stoppers at (305) 471-TIPS (8477).

Peter D'Oench

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