Page "Alexei Petrovich, Tsarevich of Russia" Paragraph 31

On 19 June, the weak and ailing tsarevich received twenty-five strokes with the knout, and then, on the 24th, he was subject to fifteen more.

On 26 June, Alexei died in the Petropavlovskaya fortress in Saint Petersburg, two days after the senate had condemned him to death for conspiring rebellion against his father, and for hoping for the cooperation of the common people and the armed intervention of his brother-in-law, the emperor.