The former head of local telecom giant KT Corp. was called in by prosecutors Thursday over alleged managerial wrongdoings and slush fund creations.

Lee Suk-chae, who resigned last month amid mounting suspicions, showed up at the Seoul Central District Prosecutors' Office in southern Seoul around 9:50 a.m. to undergo questioning.

Prosecutors have alleged that Lee inflicted huge losses on KT, the country's top fixed-line operator and No. 2 mobile carrier, by intentionally making poor investments and inking dubious business deals.

Suspicions have arisen that Lee has stashed secret funds by inflating salary figures paid to the firm's executives, prosecutors said.

Lee, a close aide to former President Lee Myung-bak, took the helm of the mobile carrier in 2009. He also served as a telecommunications minister in 1995. (Yonhap News)