Misa Amane's stalker

Ryōtarō Sakashiro is the man who wanted to kill Misa in the episode of the anime and the Death Note: The Last Name.

Plot
Sakashiro is first seen watching Misa film her cooking show, Misa-Misa's Happy Sweets. While off-set, Misa blows her nose, and throws the tissue into a small garbage can. After Misa has left, Skashiro takes the tissue out and places it into his pocket.

Sakashiro presumably follows Misa outside after she leaves the TV station, eventually causing her to flee. Claiming that he wants to reunite Misa with her family, Sakashiro chases her with a knife and says that he wants "to die for her."

Gelus, who is watching over Misa, kills Sakashiro with his Death Note. After his death, Misa finds Gelus' notebook and meets Rem.