Shrinivas Chauhan, who assisted "doctors" in conducting the transplant surgery on donors besides doing X-rays, was arrested late last night from Chandrabhaga area of Rishikesh, they said.
The arrest of Chauhan takes the number of people arrested in connection with the racket to 10, including racket kingpin Amit Raut, his brother Jivan, a nurse named Sarla, Raut's driver Billu, Rajiv Chaudhary who ran the hospital, his wife Anupama.
However, four more accused, including Raut's son Akshay, are still at large, they said, adding the police teams are searching for them at different places.