From observing the event chart, the incident occurred on Jupiter day in the hour of Venus. Typically, I have always found many shooting incidents (e.g. the Columbine shootings in 1999) to occur under Mars and sometimes Moon dominated time intervals such as Tuesdays, Mondays or Mars or Moon hours as Mars is associated with firearms and Moon is associated with the emotions, but this happens to be an exception.
In Holmes' chart, there is a partile Venus square Jupiter. They are in Mixed Rejection (Venus in Jupiter's fall, and Jupiter in Venus' detriment). The only Solar Arc he currently has is Saturn=Venus.
His secondary progressed Moon is currently in Leo. In the secondary progressions, he is currently having progressed Venus sextile Jupiter, and he may also be currently having progressed Moon trine Jupiter, progressed Moon trine Sun, and progressed Moon opposite progressed Venus.
According to Jyotish, Venus and Jupiter can be malefic for people born with certain ascendants.
I pulled up Holmes' Jyotish chart in Jagannatha Hora, and Venus gets 0-2 bindus [benefic points] (depending on what his Moon and ascendant are) in the sign it's been transiting for the last several months, which is considered bad. If he was born in the morning, his Moon would be in sidereal Leo, and both the transit of Venus and Jupiter are currently unfavorable with respect to that Moon sign. If his Moon is in sidereal Leo, then Venus would only have 1 bindu at the most in current transit.
Additionally, with natal Moon in sidereal Leo, the Moon and Sun at the time of the event would have been transiting the 12th house from his natal Moon, which is not favorable.
When Good Planets Go Bad
http://www.scribd.com/doc/4656050/VenusJupiter-as-Functional-MaleficsJyotish
How To Use Transits
http://freevedicastroadvice.wordpress.com/2011/10/19/how-to-use-transits/
Additionally, in the event chart, there is a T-Square involving Mars, Uranus, & Pluto and the fixed star Sharatan, nature of Mars & Saturn, rising (as Dr. Farr mentioned). The T-Square was aspecting Holmes' natal Neptune. Neptune does not form major aspects to any of his personal planets except for a loose sextile to Mars. Retrograde Mercury at the time of the event was also square his Pluto as was the Moon.
Holmes' Mars/Pluto conjunction and Neptune sit isolated. They are not integrated with the rest of the planets in his chart.
The following page discusses about isolated planets in the birth chart.
Enneagram Planet
http://andreayaya.typepad.com/enneagram_planet/enneagram_and_astrology/
Observing the configuration in the event chart, Mars, Moon, and Mercury were the main planets having the greatest influence in the events as they were influencing Holmes' chart the most, and the nature of the event also fit their symbolism; Mars = violence, Moon = the masses, Mercury = video viewings.
The planetary hour & day rulers Venus and Jupiter were aspecting Mars, Moon, and Mercury.
According to Jyotish principles, transits only have a significant effect if you are running the main planetary period or sub-periods of the planets involved.
Otherwise, the effects are negligible or more in the background.
For him to still have been running the Mars main period, he would have to have been born roughly between the time of 12:00 AM to 12:25 AM. The Moon sub-period is the final sub-period in Mars main period. To still be running the Mercury mini sub-period, this narrows the birth time down to 12:07 AM to 12:12 AM.
So, if he was born in this time range, he would have been running Mars/Moon/Mercury, which is fitting.
This time range would give Holmes a sidereal Virgo ascendant. According to some Jyotish astrologers, Jupiter is a functional malefic for this ascendant, but Venus is a functional benefic. Mars is also a functional malefic for this ascendant.
Below is a separate event chart.
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