STAMFORD, Conn. (CBSNewYork) — The former attorney for Fotis Dulos was back in a Connecticut courtroom Thursday.

Kent Mawhinney reportedly pleaded not guilty to conspiring to kill Dulos’ estranged wife, Jennifer Dulos, back in May.

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TIMELINE: The Investigation Into Missing Mother Jennifer Dulos

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Mawhinney was arrested in January along with Dulos’ then-girlfriend Michelle Troconis.

An arrest warrant alleges Mawhinney lied about contacts he had with Jennifer Dulos on the day she disappeared. She has not been found.

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Fotis Dulos took his own life last month. Prosecutors believe Fotis Dulos killed Jennifer Dulos, who was the mother of their five children.