Orson F. Whitney claims that Joseph gave the Masonic signal of disress as he leapt from a window at Carthage.

Date: 1888
Type: Book
Source: Orson F. Whitney
LDS
Hearsay: Unsourced
Late
Reference: Orson F. Whitney, Life of Heber C. Kimball, an Apostle; The Father and Founder of the British Mission (Salt Lake City, UT: Juvenile Instructor Office, 1888), 27
Scribe/Publisher: Juvenile Instructor Office
People: Hyrum Smith, Orson F. Whitney, Joseph Smith, Jr.
Audience: Reading Public
Transcription: Yes, Masons, it is said, were even among the mob that murdered Joseph and Hyrum in Carthage Jail. Joseph, leaping the fatal window, gave the masonic signal of distress. The answer was the roar of his murderers' muskets and the deadly balls that pierced his heart.
Source Link: https://archive.org/details/lifeheberckimba00whitgoog/page/26/mode/2up
Citations in Mormonr Qnas: Joseph & Hyrum Smith's Martyrdom
Black Saints and the Priesthood (Joseph Smith era)