Oktay Enimehmedov, the 25-year-old man who assaulted Movement for Rights and Freedoms leader Ahmed Dogan with a gas pistol, believed he was probably going to die during his attack, it emerged on Sunday.

Enimehmedov left a letter in his Sofia apartment, according to Bulgarian Interior Ministry psychology unit head Nedelcho Stoychev.

The letter was addressed to Enimehmedov's mother, Stoychev told reporters. The attacker apologized to her for completing his education and said that he was likely to be killed.

According to Stoychev, the 25-year-old man did not intend to kill Dogan.

Oktay Enimehmedov allegedly wanted to teach Dogan a lesson by showing that he is not "untouchable."

The young man has told authorities that he acted alone and that the attack was in no way connected with other individuals.

Enimehmedov burst onto the stage and pointed a gas pistol at Dogan during a televised speech at a party caucus. No shots were fired.

Dogan resigned his post as party chairman four hours after an attempt was made on his life. His resignation had been rumored as incoming in the past couple of days.

Lyutvi Mestan was elected as chair of Bulgaria's Movement for Rights and Freedoms party on Saturday, ending 23 years of Ahmed Dogan being at the helm of the party.