Mecum broke down in tears when photos of the scene were shown to the jury.
An officer who processed the scene testified that there was no forced entry into the house where Vaughn's body was found.
Prosecutors believe Mecum gave a key to her home to two men so they could kill her estranged husband.
Officials say those two men Hubert Mayhugh and James Mayhugh have already been found guilty for their involvement in the case.
More witnesses in the case will testify Tuesday.
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Witnesses take the stand in Evansville murder case
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Evansville murder victim stabbed, left to die
EPD investigating suspicious death
Evansville woman charged with suspicious death
Murder suspects arrested in Evansville
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