(CNN) — The second week of witness testimony in the murder trial of Brian Walshe is underway as prosecutors continue to work to prove he killed his wife Ana Walshe around New Year’s Day in 2023.

Much of Monday was spent revisiting the early hours and days after Ana’s purported disappearance: Prosecutors retraced what they say were Brian Walshe’s movements on the afternoon of January 1, 2023, through surveillance footage from several stores where he made cash purchases. And two of Ana’s colleagues testified about their own search for her in Washington, DC, on January 4 after Brian Walshe called the office claiming she was missing.

The jury also saw photos of evidence recovered from Brian Walshe’s home and dumpsters near his mother’s apartment that a witness said tested positive for blood.

Unbeknownst to the jury, Walshe has pleaded guilty to illegally disposing of his wife’s body and misleading police after her death. But he insists he did not kill her.

His attorneys say he found his wife dead in their bed in the early hours of the new year and panicked, fearing no one would believe he was not involved in Ana’s death. He faces life in prison without the possibility of parole if convicted of her murder.

Here’s a recap of the sixth day of witness testimony.

Various pieces of evidence tested positive for blood, witness says

A forensic scientist from the Massachusetts State Police Crime Laboratory testified he found evidence of blood on numerous items, including those recovered from the Walshe home and others Walshe allegedly threw away in dumpsters.

A kitchen knife found in a cabinet above Walshe’s refrigerator tested positive for traces of blood though there were no visible stains, according to Matthew Sheehan, the scientist.

Blood stains were also identified in several locations in the Walshe home, including on the stairs leading down to the basement and on the basement floor, Sheehan said.