The arrestee is Didarul Alam, 42, son of Md Yasin of Moulvi Bazar area in Sandwip upazila and a driver of Bakkar Paribahan.
Additional Police Superintendent of PBI Md MoinUddin said Didarul was arrested from Cumilla and brought to Chattogram in the morning.
Earlier on September 1, the helper of the bus Md Manik Sarkar, 32, was also arrested from his house in Ramgati upazila in Laxmipur district.
On August 27, Rezaul Karim Rony, 35, had an altercation with the helper of the bus which runs from New Market to Bhatiari in the port city.
At one stage, the helper pushed Rony out of the running bus, leaving him dead on the spot.
Angered at the incident, locals blocked Chattogram-Dhaka highway in front of the City Gate for half an hour.
Later, victim’s uncle filed a case with Akbar Shah Police Station.