Patna: JD(U) MLC Manorama Devi was suspended from the party for six years on Tuesday.
Her son, Rakesh Ranjan Yadav alias Rocky Yadav, who allegedly shot dead a 20-year-old youth for overtaking his vehicle, was arrested from his father's mixer plant in the district earlier today.
Police have recovered the weapon used in the crime.
"The party has suspended Manorama Devi for six years," state JD(U) president Basistha Narayan Singh said.
He said the action followed recovery of liquor from her Gaya house during a raid last night.
Manorama Devi is the wife of Bindi Yadav, a RJD strongman from Gaya who is now in jail custody in connection with the road rage.
The MLC's suspension came a little after Bihar Chief Minister Nitish Kumar returned here from Dhanbad, Jharkhand, where he attended a programme on liquor ban.
Meanwhile, Senior Superintendent of Police Garima Mallik told reporters earlier, "The main accused Rocky Yadav was arrested from his father Bindi Yadav's mixer plant located at Mastpura village of Bodh Gaya Police Station of Gaya district. Rocky was arrested along with the weapon (Bretta pistol) used in the crime," as per PTI.
Mallik claimed that Rocky, who was produced before mediapersons during a press conference with a mask on his face, had admitted to his crime in a statement.
However, while talking to reporters, Rocky claimed innocence, insisting he was in Delhi when the crime took place.
"I was in Delhi. When my mother called me I came and presented myself before the SSP. I did not open fire," Rocky told reporters as he was being whisked away by the police following the press conference.
"I'll tell everything in the court," he added.
Aditya Sachdeva was shot dead allegedly by Rocky for overtaking his vehicle in Gaya on Saturday last.
Pressure was mounting on the state government to take action against Manorama Devi after police caught Rocky, who had been absconding since the incident, in the early hours of today for the murder of Sachdeva.
Her trouble aggravated after recovery of about 18 bottles of Indian Made Foreign Liquor from her house last night in Gaya during a police raid to find her fugitive son.
Kumar had said yesterday police was probing the case independently and would initiate action against everyone found involved in the murder of the youth.
Manorama Devi had joined JD(U) in June last year and was made a MLC.
She was RJD member of state legislative council from 2003 to 2009 and shot into limelight after becoming chief of Mohanpur block in 2001.
On the other hand, Rocky was remanded to judicial custody for 14 days by a Gaya court and sent to the Central Jail there.
(With PTI inputs)