Here is some alternative information on his death date and citations:
The Alsop Family in England
See the Search For The Passengers of the Mary & John 1630, Vol. 17 (1992), pages 12-16 for further details of the Alsop family ancestry. Current speculation is that Rev. John ALSOP may have been grandson of Humphrey ALSOP, and son of William ALSOP of Alsop, Derby, and Isabel WARNER, daughter of John WARNER of Markfield, Leicester. The sons of William and Isabel ALSOP were Humphrey, John, Charles, William and George.
Rev. John ALSOP - b. about 1565. Vicar of Chilton-upon-Polden, Somersetshire, 1600-1605, and as preacher in the parish of Crewkerne, Somersetshire, 1607-1614.
1. Rev. John - b. about 1600; d. early 1647/8, Cambridge, Essex. Fellow of Christ's College, Cambridge, 1623-1639; Proctor, 1634; Dean of Christ's College, and Mildmay Preacher, 1636-1639; rector of Fordham Essex, 1633-1643; and rector of Great Wigborough, Essex, 1639. Having been chaplain to Archbishop Laud, he was banished and fled to France, living with Charles II in his exile. While in France, John was personally acquainted with Descartes. His will, dated Sep. 6, 1647 and probated Feb. 5, 1647/8, names his brothers Samuel, Timothy and Josias, and sister Elizabeth.
2. Rev. Samuel - b. about 1605; bur. Jun. 6, 1657, St. James, Clerkenwell, London. Preacher at Fordham, Essex, 1634; vicar of Acton All Saints, Suffolk, 1634-43; rector at Caerwent, Monmouth to 1649; rector of Sudwell, Whiltshire to death.
3. Timothy - bap. Nov. 17, 1607, Crewkerne, Somersetshire; d. August 1664, St. Mary Somerset, London. A merchant, Timothy was associated with the Brewers' Company of London. He is mentioned in 1663 and 1664 entries in the Diary of Samuel PEPYS. His will, dated Jul. 25, 1664 and probated Aug. 19, 1664, names his sister Elizabeth. Married second Nov. 15, 1659 in St. Peter Cornhill, London to Martha SEDGEWICK. Children: Betty; Prudence; Mary; Timothy; and Rev. Josias.
4. Rev. Josias - bap. Dec. 2, 1610, Crewkerne, Somersetshire; d. by Oct. 1666, St. Clements Eastcheap, London. Rector of Houghton Gildable, Bedford, 1637; rector of Norton Fitzwarren, Somerset, 1638; minister and rector at St. Clements Eastcheap, London 1649-1666. Mentioned in the Diary of Samuel PEPYS under the date Nov. 24, 1661. His will, dated Aug. 12, 1666 and probated Oct. 9, 1666, names his brother Timothy, and "Mrs. Elizabeth Rossiter, my sister in New England."
5. Elizabeth - bap. Feb. 15, 1613/4, Crewkerne, Somersetshire; d. Aug. 29, 1669, Guilford, CT. Married Dr. Bray ROSSITER.
http://kinnexions.com/smlawson/rossiter.htm#Alsophttp://kinnexions....
Two different John Alsops. Above is John, son of William, of Crewkerne. The other was John, son of Anthony, of Derby, who married Temperance Gilbert. They’ve become mixed on geni.
Quick reference
https://www.wikitree.com/wiki/Alsop-115