Wichita police have arrested a man and woman in connection to the death of their 2-year-old son at a mobile home on the south side. 

Jail records show 28-year-old Patrick Javonovich and 22-year-old Brandi Marchant were each booked for first degree murder and two counts of aggravated child endangerment. They're held on $200,000 bond each. 

Police spokesperson Charley Davidson said officers responded at around 11:30 p.m. Thursday to a report of domestic violence at the Riverside Mobile Home Park in the 4500 block of South Hydraulic.

Neighbor Shannon Higgins described a frightening scene.

"I turned around to head back to the house when I heard a woman wailing in a way that made my stomach sink," he said. "So then I called 911 "

Higgins said he saw a man push a woman inside the mobile home and shut the door. Police showed up minutes later. 

Officers made contact with couple who were walking back to the residence and had left the toddler and baby home alone, Davidson said. They entered the home and found the toddler, identified as Zaiden Javonovich, unresponsive in a crib. He was pronounced dead at the scene. 

Davidson said the 4-month-old boy required medical care and remained hospitalized Friday morning and that he will be placed in protective custody when he is discharged. 

The grieving has begun. Higgins said the child's grandfather showed up at the couple's home on Friday.

"It wasn't until I turned the corner that I realized this was obviously a loved one or something that is begging this isn't true...hoping they would answer the door," Higgins said. "I started having tears in my eyes because I knew I just walked into someone's nightmare."

Officer Davidson said Javonovich and Marchant are Zaiden's biological parents and that Marchant is the baby's biological mother. Police have not said how Zaiden died. 

"The Wichita Police Department has not had any other cases involving child abuse with these two children and these two adults," Davidson said. "However, I can say that police contact has been made with the adults in the past...multiple different issues."

The investigation is ongoing.