Daudi Nzomo, 36, was arrested at Nguu market on Thursday, with the help of residents.
Makueni county commissioner Mohammed Maalim said he was taken to Nguu AP camp.
"Police had been pursuing him since Tuesday after the video clip went viral," Maalim told journalists.
Reports indicated that residents baying for Nzomo's blood surrounded the camp.
The victim identified as Mwende, 33, is at Makueni Level Four Hospital.
Makueni county police commander Joseph Napeiyan said the assault took place on Monday.
-MUTUA KAMETI