Prosecutors have rested their case in the retrial for a Butler County man accused of killing his wife and three family members in 2019.The second trial for Gurpreet Singh is happening with a three-judge panel that is expected to make the decision. Singh's first trial ended in a hung jury.The trial has been ongoing since last Monday, with prosecutors calling multiple people to take the stand and building a timeline of what they say happened on the night of April 28, 2019, in West Chester. On the night of the murders, Singh called 911 saying he found his family on the floor, bleeding.Two months later, he was arrested for the murders of his wife Shalinderjit Kaur, her parents Hakikat Singh Pannag and Parmjit Kaur, and Parmjit's sister, Amarjit Kaur.Two days after the killings, officers found the murder weapon in a pond about 35 feet from the patio of the victims' apartment.Prosecutors, accusing Singh of committing the murders, pointed to a long-standing affair and a hostile relationship with his father-in-law as motive. Because this is a capital case, a three-judge panel is hearing the case. Those judges include Judge Greg Howard, Judge Keith Spaeth and Judge Greg Stephens.On Wednesday, the panel heard from a blood splatter expert from the Ohio Bureau of Criminal Investigations. He testified about the blood patterns found on the four victims inside their West Chester apartment.If found guilty, Singh could face the death penalty.The defense will now have the opportunity to call witnesses to the stand and present its case to the three-judge panel. The defense said it will call one witness to the stand on Thursday, with closing arguments possible as soon as Friday.