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We report on 2.4 yr of radio timing measurements of the magnetar PSRJ1622$-$4950 using the Parkes telescope, between 2011 November and 2014 March.During this period the torque on the neutron star (inferred from the rotationalfrequency derivative) varied greatly, though much less erratically than in the2 yr following its discovery in 2009. During the last year of our measurementsthe frequency derivative decreased in magnitude monotonically by 20\%, to avalue of $-1.3\times10^{-13}$ s$^{-2}$, a factor of 8 smaller than whendiscovered. The flux density continued to vary greatly during our monitoringthrough 2014 March, reaching a relatively steady low level after late 2012. Thepulse profile varied secularly on a similar timescale as the flux density andtorque. A relatively rapid transition in all three properties is evident inearly 2013. After PSR J1622$-$4950 was detected in all of our 87 observationsup to 2014 March, we did not detect the magnetar in our resumed monitoringstarting in 2015 January and have not detected it in any of the 30 observationsdone through 2016 September.

Spin-down evolution and radio disappearance of the magnetar PSR J1622$-$4950