A woman and her five-month old minor girl were strangulated to death reportedly by her husband at Gopalhati village in Puthia upazila on Monday night.
The deceased were identified as Poly Khatun, wife of Firoz and their daughter Faria.
Rezaul Islam said that Firoz who was a bus supervisor, lost his leg in a road accident and became drug addicted. He used to quarrel with his wife over drug money.
Police suspected that Firoz killed his wife and daughter over drug money.
After the incident, he went into hiding.
However, police managed to arrest him from Gabtoli area in the capital early Tuesday and he has been taken to Rajshahi.