Chaudhary, who is lodged in an Ambala jail, was suspended from the party's primary membership Jan 16.
He is one of four suspects in the murder of a 24-year-old woman in Panchkula in Haryana Nov 22.
After evading arrest, Chaudhary surrendered before a Panchkula court Jan 8, the day other legislators took oath.
Chaudhary is a first-time legislator from Doon in Solan district. He is the son of four-time Congress legislator Lajja Ram.