Sukhdev Singh Namdhari is accused of murder and criminal trespass on Ponty's Chattarpur farmhouse.
Tyagi had been charged with criminal conspiracy and was arrested on Monday on charges of allegedly murdering Hardeep Chadha.
The Ex-Uttarakhand Minority Commission chief has been sent to 5-day police custody after he admitted to firing at Hardeep Chadha.
Namdhari, a close aide of Ponty, on Saturday admitted to having fired at Hardeep during the scuffle between the two brothers.
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