I have yet to read a detailed history of that episode.
Y D Phadke (य दि फडके) has a chapter dedicated to it in his book 'Shodh Savarkarancha', 1984 ('शोध सावरकरांचा').
There I learnt Jackson was shot just before the play started, Bal Gandharva (बालगंधर्व) and Nanasaheb Joglekar (नानासाहेब जोगळेकर) were actors in it.
I have not read the feelings of Bal Gandharva or Nanasaheb Joglekar about this horrific incident. Or the reaction of the paying public. I wonder if they got their ticket money back if the performance was cancelled! And even if they did, I am sure, many must be deeply disappointed that they missed the show. Kanhere and his two colleagues had paid twelve annas each for the ticket.
Book also says that Rajarshi Shahu Maharaj (राजर्षी शाहू महाराज), ruler of Kolhapur, had warned the British government in 1906 about the possibility of extreme violence because of the views of Brahmins from the districts of Kolhapur, Belgao, Nashik and Pune (page 6, 'Shodh Savarkarancha', 1984-2000).
Following is the account of the case that is available on the website of Bombay High Court:
"...Unlike other English district officers, he (Jackson) was sympathetic towards Indian aspirations, was a student of Sanskrit, and generally was popular as a man of learning and culture.
It was his interest in Indian history and culture, which induced him to attend the performance of a Marathi drama at Nasik. During an interval in the performance, a young Brahmin student of Aurangabad, named Anant Kanhere, stepped forward, drew out a pistol and shot Mr. Jackson through the heart at point blank range.
The murder created a great deal of sensation in Nasik, Poona and Bombay; and it even created consternation in the ranks of Indian Nationalists, because of Jackson's reputation as a very sympathetic and popular district officer.
Many Indians could not understand why such a good man ("good Topivalla ", as such Englishmen were called in those days) was singled out for such a dastardly murder. But it seems that there was a school of extremists at the time, who believed perversely that, these "good Topivallas" were really more dangerous than officers of the type of Dyer and O'Dwyer, for instance; for, it is the good popular government officials who reconcile Indians to foreign rule..."
The journal of the Anthropological Society of Bombay wrote: "The Society records its deep sense of grief for death of one of its most learned members,AMT Jackson, ICS."
Bimanbehari Majumdar: "...Jackson was a learned Indologist. He contributed many interesting papers on Indian history and culture and was popularly known as Pandit Jackson..." (Militant nationalism in India and its socio-religious background, 1897-1917)
Sir John Cumming: "...the late Mr. A M T Jackson drew out attention to 'the attractive power of Hindu civilization, which has enabled it to assimilate and absorb into itself every Foreign invader except the Moslem and European..." ('Revealing India's Past')
(Savarkar would agree with Jackson's views on lack of assimilation of Muslims. It also shows how Europeans had now transcended 'White Mughals' phase. It was the phase, documented most notably by William Dalrymple, in which they tried to assimilate.)
On Google Books I found following books by A M T Jackson:
"Folk Lore Notes: Vol. II - Konkan
Folk lore notes: Compiled from materials collected by the late A. M. T. Jackson. R. E. Enthoven, Volume 1
Folklore notes from Gujarat and the Konkan
Folklore of Gujarat
Folklore Notes V2: Konkan (1915)"
I remember to have read Durga Bhagwat (दुर्गा भागवत) writing that the chase of Jackson's valuable library was entrusted to the Royal Asiatic Society, Mumbai. (Read my blogpost dated July 26 2013: Coppersmith Barbet, Green Rose & Books- A M T Jackson & Durga Bhagwat-... तांबट पक्षी, हिरवा गुलाब आणि ढीगभर पुस्तके)
I don't know what family Jackson left behind. Wife, kids, parents?
In Frontline dated Sep. 12-25, 2009, A.R. VENKATACHALAPATHY has written about the assassination of Robert William Escourt Ashe on June 17, 1911.
I was most moved by this family photo of Ashe's.
PICTURE FROM THE ASHE FAMILY ALBUM/
COURTESY ROBERT ASHE and Frontline