Original sentence: This double-storeyed octagonal tower of red sandstone was built by Sher Shah and was used as a library by Humayun after he recaptured the fort.This was also the tragic spot where, on 24 January, 1556 Humayun slipped off the stairs, missed his footing and stumbled to his death
Edited sentence: The structure was intended to be higher than its existing height but the work was stopped due to untimely death of Sher Shah.This double-storeyed octagonal tower of red sandstone with steep stairs leading up to the roof.This was also the tragic spot where, on 24 January, 1556 Humayun slipped off the stairs on his way to the evening namaz, missed his footing and stumbled to his death two day later.was built by Sher Shah and was used as a library by Humayun after he recaptured the fort