Late of His Majesty's 17th Regiment of Foot. Brother of Arthur and Spencer Trimmer. Arrived with brother Arthur, another brother Spencer arrived earlier. Selected 15,200 acres with his brother Arthur. Daughter Emily Jane (born 1828) arrived with George and Grace Cheyne on the 'Sterling' in 1831. William drowned 31 December 1835 in the Swan River. Left his estate to his mother and his daughter Emily. Emily then married Andrew Moir at Albany in 1848.