Tata Motors Managing Director Karl Slym most probably killed himself because of domestic discord, investigators probing the death of the executive said.

Fifty-one-year-old Slym died in Bangkok on Sunday after falling from the 22nd floor of the Shangri-La hotel in Bangkok, where he was staying with his wife. Before his death, he had attended a board meeting of the Indian auto giant's Thailand arm in the capital. Hotel staff found his body on the fourth floor which juts out above the hotel's lower floors.

Police Lieutenant Somyot Boonyakaew, the head of the investigation team, said initial investigation indicated that Slym killed himself as they did not find any sign of struggle.

Boonyakaew told reporters, "We didn't find any sign of struggle. We found a window open. The window was very small so it was not possible that he would have slipped."

He added that he had to climb through the small window to fall out as he was a big man, adding that initial investigation indicated that he had jumped from the window.

Investigators also found a three-page note, written in English, from Slym's room in the hotel. The note contained a reference to domestic problems. Investigators are analyzing the note to confirm if it was written by the executive.

Stock in Tata Motors slipped 5 per cent in afternoon trade on Monday.