LI Man Accused of Killing Estranged Wife, Injuring Teen, Pleads Not Guilty

Marcos Marques-Leal allegedly stabbed Adriana Barbosa to death in her home, also injuring a teenage relative who tried to intervene.

Published on Feb. 21, 2026

Got story updates? Submit your updates here. ›

Marcos Marques-Leal, 57, has been accused of stabbing his estranged wife Adriana Barbosa, 46, to death inside her Farmingville, New York home on Friday evening. A teenage relative who was present during the attack suffered superficial wounds when she tried to intervene. Marques-Leal pleaded not guilty to a murder charge in court on Tuesday.

Why it matters

Domestic violence incidents like this one highlight the ongoing need for better resources and support systems to help prevent such tragedies. This case also raises questions about the couple's history and whether there were any prior warning signs or opportunities to intervene before the fatal attack occurred.

The details

According to police, Marques-Leal attacked Barbosa inside her home around 8:15 pm on Friday. A teenage relative who was present during the incident suffered minor injuries when she tried to stop the attack. Marques-Leal also stabbed himself and was taken to the hospital under police guard. He has been charged with second-degree murder, first-degree criminal contempt, and endangering the welfare of a child.

  • The attack occurred around 8:15 pm on Friday, February 14, 2026.
  • Marques-Leal pleaded not guilty to the charges in court on Tuesday, February 18, 2026.

The players

Marcos Marques-Leal

A 57-year-old Farmingville, New York resident who has been accused of stabbing his estranged wife to death.

Adriana Barbosa

A 46-year-old woman who was allegedly stabbed to death by her estranged husband Marcos Marques-Leal inside her Farmingville home.

The Teenage Relative

A child relative of Barbosa, in her teens, who suffered superficial wounds when she tried to intervene and stop the attack.

Got photos? Submit your photos here. ›

What they’re saying

“As a community of the Brazilian Gospel Church, we mourn with you, and we entrust your soul into the loving arms of our Lord, remembering the promise of eternal life through our Jesus Christ. May the peace of God, which surpasses all understanding, comfort your hearts in this time of sorrow, and may the memories of her faith, kindness, and love remain as an enduring blessing to all who knew her.”

— Church Leaders (Facebook)

What’s next

The judge in the case will decide on Tuesday whether or not to allow Marcos Marques-Leal out on bail.

The takeaway

This tragic case highlights the ongoing need for better domestic violence prevention and intervention programs to help identify warning signs and protect vulnerable individuals before such violent acts occur. It also underscores the importance of providing robust support services for families impacted by domestic abuse.