Warning, contains profanity

He or she signed the letters, "The Watcher."

 A couple purchased their dream house in Westfield, New Jersey.  They did some renovating and slowly began to move into the house located at 657 Boulevard, but started to receive a series of creepy and threatening letters from "the watcher."  Police were brought in, private investigators were too.  Even two former FBI agents were asked to help identify who the Watcher could be, but nothing was ever definitely found out.  Another horror story for new home owners, but not really a haunting in the traditional sense.  Creepy, nonetheless.

References

"The Watcher"*This article appears in the November 12, 2018, issue of New York Magazine.

'The Watcher’ house is sold years after a family was terrorized with creepy letters

By Allen Kim, CNN, August 12, 2019

All music purdhased and licensed through Pond 5