SARASOTA (CBSMiami/AP) — A Florida man faces life in prison after a jury found him guilty of second-degree murder and child neglect in the death of his ex-girlfriend’s 2-year-old son in August 2017.

Prosecutors say David Vickers, 33, was babysitting Luca Sholey while his girlfriend worked. He reportedly told investigators he put the boy down for a nap and found him unresponsive an hour later. An autopsy found the boy had six broken ribs in different stages of healing.

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The Bradenton Herald reports the boy’s death was the result of asphyxia.

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Jurors convicted Vickers in less than three hours.

Vickers was released from prison in 2017 after serving time for trafficking in stolen property.

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(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)