Why does dr roylott pay a visit to Holmes?

Dr. Roylott visits Sherlock Holmes to confront him about his investigation into the mysterious circumstances surrounding the death of his stepdaughter, Julia Stoner. He is suspicious of Holmes's involvement and seeks to intimidate him, hoping to deter any further scrutiny into his family's affairs. Roylott's aggressive demeanor suggests he has something to hide, which ultimately leads to the unraveling of the case.